Vulnerabilities addressed in the April 2021 security updates were responsibly reported to Microsoft by a security partner. Although we are not aware of any active exploits in the wild, our recommendation is to install these updates immediately to protect your environment.
These vulnerabilities affect Microsoft Exchange Server. Exchange Online customers are already protected and do not need to take any action.
Use the Exchange Server Health Checker script, which can be downloaded from GitHub (use the latest release), to inventory your servers. Running this script will tell you if any of your Exchange Servers are behind on updates (CUs and SUs).
Update to the latest Cumulative Update
Go to https://aka.ms/ExchangeUpdateWizard and choose your currently running CU and your target CU. Then click the “Tell me the steps” button, to get directions for your environment.
If you encounter errors during or after installation of Exchange Server updates
My organization is in Hybrid mode with Exchange Online. Do I need to do anything? While Exchange Online customers are already protected, the April 2021 security updates do need to be applied to your on-premises Exchange Server, even if it is used only for management purposes. You do not need to re-run the Hybrid Configuration Wizard (HCW) after applying updates.
Do the April 2021 security updates contain the March 2021 security updates for Exchange Server? Yes, our security updates are cumulative. Customers who installed the March 2021 security updates for supported CUs can install the April 2021 security updates and be protected against the vulnerabilities that were disclosed during both months. If you are installing an update manually, do not double-click on the .msp file, but instead run the install from an elevated CMD prompt.
Is Microsoft planning to release April 2021 security updates for older (unsupported) versions of Exchange CUs? No, we have no plans to release the April 2021 security updates for older or unsupported CUs. In March, we took unprecedented steps and released SUs for unsupported CUs because there were active exploits in the wild. You should update your Exchange Servers to supported CUs and then install the SUs. There are 47 unsupported CUs for the affected versions of Exchange Server, and it is not sustainable to release updates for all of them. We strongly recommend that you keep your environments current.
Can we use March 2021 mitigation scripts (like EOMT) as a temporary solution? The vulnerabilities fixed in the April 2021 updates are different from those we fixed before. Therefore, running March 2021 security tools and scripts will not mitigate the vulnerabilities fixed in April 2021. You should update your servers as soon as possible. Please note that if March EOMT is ran after April updates are installed, it will mistakenly mention that systems are possibly vulnerable (As EOMT is not aware of April updates).
Do I need to install the updates on ‘Exchange Management Tools only’ workstations? Servers or workstations running only Microsoft Exchange Management Tools (no Exchange services) do not need to apply these updates.
Why are there security updates two months in a row? Microsoft regularly releases Exchange Server security updates on ‘patch Tuesday’. We are always looking for ways to make Exchange Server more secure. You should expect us to continue releasing updates for Exchange Server in the future. The best way to be prepared for new updates is to keep your environment current.
Is there no update for Exchange Server 2010? No, Exchange 2010 is not affected by the vulnerabilities fixed in the April 2021 security updates.
Is there a specific order of installation for the April 2021 security updates? We recommend that you update all on-premises Exchange Servers with the April 2021 security updates using your usual update process.
Known Issues
After application of the Exchange Server April security update CMDlets executed against the Exchange Management Console using an invoked runspace might fail with the following error message: The syntax is not supported by this runspace. This can occur if the runspace is in no-language mode. Please see the following KB article: “The syntax is not supported by this runspace” error after installing April 2021 Exchange security update.
Administrator or Service accounts ending in symbol '$' might fail connecting to Exchange Management Shell or ECP. The only workaround at this time is to use accounts without the symbol '$' at the end of the name.
Major updates to this post:
5/4: Edits to Known Issues section
4/16: Added a Known Issues section
4/14: Added info to March EOMT note and behavior after April updates are installed
4/13: Changed download links to the KB article (has additional download information)
4/13: Fixed a typo in the upgrade path graphics (to reflect correct CUs for Exchange Server 2019)
Process information: Process ID: 6568 Process name: w3wp.exe Account name: NT AUTHORITY\SYSTEM
Exception information: Exception type: ArgumentException Exception message: Invalid input value Parameter name: input at Microsoft.Exchange.Data.ApplicationLogic.Cafe.BackEndServer.FromString(String input) at Microsoft.Exchange.HttpProxy.BEResourceRequestHandler.ResolveAnchorMailbox() at Microsoft.Exchange.HttpProxy.ProxyRequestHandler.InternalBeginCalculateTargetBackEnd(AnchorMailbox& anchorMailbox) at Microsoft.Exchange.HttpProxy.ProxyRequestHandler.<BeginCalculateTargetBackEnd>b__278_0() at Microsoft.Exchange.Common.IL.ILUtil.DoTryFilterCatch(Action tryDelegate, Func`2 filterDelegate, Action`1 catchDelegate) at Microsoft.Exchange.HttpProxy.ProxyRequestHandler.CallThreadEntranceMethod(Action method)
Request information: Request URL: https://publicip/ecp/pentest.js Request path: /ecp/pentest.js User host address: User: Is authenticated: False Authentication Type: Thread account name: NT AUTHORITY\SYSTEM
Thread information: Thread ID: 8 Thread account name: NT AUTHORITY\SYSTEM Is impersonating: False Stack trace: at Microsoft.Exchange.Data.ApplicationLogic.Cafe.BackEndServer.FromString(String input) at Microsoft.Exchange.HttpProxy.BEResourceRequestHandler.ResolveAnchorMailbox() at Microsoft.Exchange.HttpProxy.ProxyRequestHandler.InternalBeginCalculateTargetBackEnd(AnchorMailbox& anchorMailbox) at Microsoft.Exchange.HttpProxy.ProxyRequestHandler.<BeginCalculateTargetBackEnd>b__278_0() at Microsoft.Exchange.Common.IL.ILUtil.DoTryFilterCatch(Action tryDelegate, Func`2 filterDelegate, Action`1 catchDelegate) at Microsoft.Exchange.HttpProxy.ProxyRequestHandler.CallThreadEntranceMethod(Action method)
Has anyone running Exchange 2013 noticed their eDiscovery is broken after the April update? We've been running on the April update since right after it was released but just today I went to run a new eDiscovery and I am now getting an Error 400 Bad Request error for just those functions. The last time I ran one of these searches was just before the update so it seems to be related to the patch. Any thoughts?
after not hearing from you for so long I finally applied security path of April 13th on my staging and production Exchange 2019 CU9 this Thursday and everything works fine.
One common event warning I noticed before and after applying the patch is this. If you anyone experienced the same then please update.
Event code: 3005 Event message: An unhandled exception has occurred. Event time: 5/22/2021 7:46:56 AM Event time (UTC): 5/22/2021 3:46:56 AM Event ID: c2abd3c344584b7599413857078a5301 Event sequence: 6 Event occurrence: 5 Event detail code: 0
Process information: Process ID: 812 Process name: w3wp.exe Account name: NT AUTHORITY\SYSTEM
Exception information: Exception type: ArgumentException Exception message: Invalid input value Parameter name: input at Microsoft.Exchange.Data.ApplicationLogic.Cafe.BackEndServer.FromString(String input) at Microsoft.Exchange.HttpProxy.OwaResourceProxyRequestHandler.ResolveAnchorMailbox() at Microsoft.Exchange.HttpProxy.ProxyRequestHandler.InternalBeginCalculateTargetBackEnd(AnchorMailbox& anchorMailbox) at Microsoft.Exchange.HttpProxy.ProxyRequestHandler.<BeginCalculateTargetBackEnd>b__278_0() at Microsoft.Exchange.Common.IL.ILUtil.DoTryFilterCatch(Action tryDelegate, Func`2 filterDelegate, Action`1 catchDelegate) at Microsoft.Exchange.HttpProxy.ProxyRequestHandler.CallThreadEntranceMethod(Action method)
Request information: Request URL: https://85.68.45.35:443/owa/auth/x.js Request path: /owa/auth/x.js User host address: 192.168.1.1 User: Is authenticated: False Authentication Type: Thread account name: NT AUTHORITY\SYSTEM
Thread information: Thread ID: 121 Thread account name: NT AUTHORITY\SYSTEM Is impersonating: False Stack trace: at Microsoft.Exchange.Data.ApplicationLogic.Cafe.BackEndServer.FromString(String input) at Microsoft.Exchange.HttpProxy.OwaResourceProxyRequestHandler.ResolveAnchorMailbox() at Microsoft.Exchange.HttpProxy.ProxyRequestHandler.InternalBeginCalculateTargetBackEnd(AnchorMailbox& anchorMailbox) at Microsoft.Exchange.HttpProxy.ProxyRequestHandler.<BeginCalculateTargetBackEnd>b__278_0() at Microsoft.Exchange.Common.IL.ILUtil.DoTryFilterCatch(Action tryDelegate, Func`2 filterDelegate, Action`1 catchDelegate) at Microsoft.Exchange.HttpProxy.ProxyRequestHandler.CallThreadEntranceMethod(Action method)
Corbett_Endersnot afaik, the suggested solution is 'don't use a $' atm I think. Because that's in part what was causing the free busy problem and the workaround/fix is federation OR use dedicated svc account instead of computernames with $ at the end
How does one access Microsoft Exchange Developer Support? I tried opening a developer case using all of our MS Silver Partner avenues and could not get the right answer.
I was suspecting that once the account that being authenticate in cross forest is the exchange server computer name$ and thats the reason we get the 401 unauthorized. Once i changed to UseServiceAccount $false instead to $true it WORKS!
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April 2021 Exchange Server Security 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We are releasing a set of security updates for Exchange Server 2013, 2016 and 2019.
","body":"
Microsoft has released security updates for vulnerabilities found in:
\n
\n
Exchange Server 2013
\n
Exchange Server 2016
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Exchange Server 2019
\n
\n
These updates are available for the following specific builds of Exchange Server:
\n
IMPORTANT: If manually installing security updates, you must install .msp from elevated command prompt (see Known Issues in update KB article).
Vulnerabilities addressed in the April 2021 security updates were responsibly reported to Microsoft by a security partner. Although we are not aware of any active exploits in the wild, our recommendation is to install these updates immediately to protect your environment.
\n
These vulnerabilities affect Microsoft Exchange Server. Exchange Online customers are already protected and do not need to take any action.
Use the Exchange Server Health Checker script, which can be downloaded from GitHub (use the latest release), to inventory your servers. Running this script will tell you if any of your Exchange Servers are behind on updates (CUs and SUs).
\n
Update to the latest Cumulative Update
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Go to https://aka.ms/ExchangeUpdateWizard and choose your currently running CU and your target CU. Then click the “Tell me the steps” button, to get directions for your environment.
\n
\n
If you encounter errors during or after installation of Exchange Server updates
My organization is in Hybrid mode with Exchange Online. Do I need to do anything? While Exchange Online customers are already protected, the April 2021 security updates do need to be applied to your on-premises Exchange Server, even if it is used only for management purposes. You do not need to re-run the Hybrid Configuration Wizard (HCW) after applying updates.
\n
Do the April 2021 security updates contain the March 2021 security updates for Exchange Server? Yes, our security updates are cumulative. Customers who installed the March 2021 security updates for supported CUs can install the April 2021 security updates and be protected against the vulnerabilities that were disclosed during both months. If you are installing an update manually, do not double-click on the .msp file, but instead run the install from an elevated CMD prompt.
\n
Is Microsoft planning to release April 2021 security updates for older (unsupported) versions of Exchange CUs? No, we have no plans to release the April 2021 security updates for older or unsupported CUs. In March, we took unprecedented steps and released SUs for unsupported CUs because there were active exploits in the wild. You should update your Exchange Servers to supported CUs and then install the SUs. There are 47 unsupported CUs for the affected versions of Exchange Server, and it is not sustainable to release updates for all of them. We strongly recommend that you keep your environments current.
\n
Can we use March 2021 mitigation scripts (like EOMT) as a temporary solution? The vulnerabilities fixed in the April 2021 updates are different from those we fixed before. Therefore, running March 2021 security tools and scripts will not mitigate the vulnerabilities fixed in April 2021. You should update your servers as soon as possible. Please note that if March EOMT is ran after April updates are installed, it will mistakenly mention that systems are possibly vulnerable (As EOMT is not aware of April updates).
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Do I need to install the updates on ‘Exchange Management Tools only’ workstations? Servers or workstations running only Microsoft Exchange Management Tools (no Exchange services) do not need to apply these updates.
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Why are there security updates two months in a row? Microsoft regularly releases Exchange Server security updates on ‘patch Tuesday’. We are always looking for ways to make Exchange Server more secure. You should expect us to continue releasing updates for Exchange Server in the future. The best way to be prepared for new updates is to keep your environment current.
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Is there no update for Exchange Server 2010? No, Exchange 2010 is not affected by the vulnerabilities fixed in the April 2021 security updates.
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Is there a specific order of installation for the April 2021 security updates? We recommend that you update all on-premises Exchange Servers with the April 2021 security updates using your usual update process.
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Known Issues
\n\n
After application of the Exchange Server April security update CMDlets executed against the Exchange Management Console using an invoked runspace might fail with the following error message: The syntax is not supported by this runspace. This can occur if the runspace is in no-language mode. Please see the following KB article: “The syntax is not supported by this runspace” error after installing April 2021 Exchange security update.
Administrator or Service accounts ending in symbol '$' might fail connecting to Exchange Management Shell or ECP. The only workaround at this time is to use accounts without the symbol '$' at the end of the name.
\n\n
Major updates to this post:
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5/4: Edits to Known Issues section
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4/16: Added a Known Issues section
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4/14: Added info to March EOMT note and behavior after April updates are installed
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4/13: Changed download links to the KB article (has additional download information)
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4/13: Fixed a typo in the upgrade path graphics (to reflect correct CUs for Exchange Server 2019)
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The Exchange Team
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Microsoft has released security updates for vulnerabilities found in:
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Exchange Server 2013
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Exchange Server 2016
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Exchange Server 2019
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These updates are available for the following specific builds of Exchange Server:
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IMPORTANT: If manually installing security updates, you must install .msp from elevated command prompt (see Known Issues in update KB article).
Vulnerabilities addressed in the April 2021 security updates were responsibly reported to Microsoft by a security partner. Although we are not aware of any active exploits in the wild, our recommendation is to install these updates immediately to protect your environment.
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These vulnerabilities affect Microsoft Exchange Server. Exchange Online customers are already protected and do not need to take any action.
Use the Exchange Server Health Checker script, which can be downloaded from GitHub (use the latest release), to inventory your servers. Running this script will tell you if any of your Exchange Servers are behind on updates (CUs and SUs).
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Update to the latest Cumulative Update
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Go to https://aka.ms/ExchangeUpdateWizard and choose your currently running CU and your target CU. Then click the “Tell me the steps” button, to get directions for your environment.
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If you encounter errors during or after installation of Exchange Server updates
My organization is in Hybrid mode with Exchange Online. Do I need to do anything? While Exchange Online customers are already protected, the April 2021 security updates do need to be applied to your on-premises Exchange Server, even if it is used only for management purposes. You do not need to re-run the Hybrid Configuration Wizard (HCW) after applying updates.
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Do the April 2021 security updates contain the March 2021 security updates for Exchange Server? Yes, our security updates are cumulative. Customers who installed the March 2021 security updates for supported CUs can install the April 2021 security updates and be protected against the vulnerabilities that were disclosed during both months. If you are installing an update manually, do not double-click on the .msp file, but instead run the install from an elevated CMD prompt.
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Is Microsoft planning to release April 2021 security updates for older (unsupported) versions of Exchange CUs? No, we have no plans to release the April 2021 security updates for older or unsupported CUs. In March, we took unprecedented steps and released SUs for unsupported CUs because there were active exploits in the wild. You should update your Exchange Servers to supported CUs and then install the SUs. There are 47 unsupported CUs for the affected versions of Exchange Server, and it is not sustainable to release updates for all of them. We strongly recommend that you keep your environments current.
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Can we use March 2021 mitigation scripts (like EOMT) as a temporary solution? The vulnerabilities fixed in the April 2021 updates are different from those we fixed before. Therefore, running March 2021 security tools and scripts will not mitigate the vulnerabilities fixed in April 2021. You should update your servers as soon as possible. Please note that if March EOMT is ran after April updates are installed, it will mistakenly mention that systems are possibly vulnerable (As EOMT is not aware of April updates).
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Do I need to install the updates on ‘Exchange Management Tools only’ workstations? Servers or workstations running only Microsoft Exchange Management Tools (no Exchange services) do not need to apply these updates.
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Why are there security updates two months in a row? Microsoft regularly releases Exchange Server security updates on ‘patch Tuesday’. We are always looking for ways to make Exchange Server more secure. You should expect us to continue releasing updates for Exchange Server in the future. The best way to be prepared for new updates is to keep your environment current.
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Is there no update for Exchange Server 2010? No, Exchange 2010 is not affected by the vulnerabilities fixed in the April 2021 security updates.
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Is there a specific order of installation for the April 2021 security updates? We recommend that you update all on-premises Exchange Servers with the April 2021 security updates using your usual update process.
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Known Issues
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After application of the Exchange Server April security update CMDlets executed against the Exchange Management Console using an invoked runspace might fail with the following error message: The syntax is not supported by this runspace. This can occur if the runspace is in no-language mode. Please see the following KB article: “The syntax is not supported by this runspace” error after installing April 2021 Exchange security update.
Administrator or Service accounts ending in symbol '$' might fail connecting to Exchange Management Shell or ECP. The only workaround at this time is to use accounts without the symbol '$' at the end of the name.
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Major updates to this post:
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5/4: Edits to Known Issues section
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4/16: Added a Known Issues section
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4/14: Added info to March EOMT note and behavior after April updates are installed
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4/13: Changed download links to the KB article (has additional download information)
\n
4/13: Fixed a typo in the upgrade path graphics (to reflect correct CUs for Exchange Server 2019)
We are releasing a set of security updates for Exchange Server 2013, 2016 and 2019.
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Released: April 2021 Exchange Server Security Updates","moderationData":{"__ref":"ModerationData:moderation_data:3043540"},"body":"
Dear All,
I am getting below error on in-house Exchange 2019 CU9, any idea what it is? apricate your help \"Request path: /ecp/pentest.js\"
Process information: Process ID: 6568 Process name: w3wp.exe Account name: NT AUTHORITY\\SYSTEM
Exception information: Exception type: ArgumentException Exception message: Invalid input value Parameter name: input at Microsoft.Exchange.Data.ApplicationLogic.Cafe.BackEndServer.FromString(String input) at Microsoft.Exchange.HttpProxy.BEResourceRequestHandler.ResolveAnchorMailbox() at Microsoft.Exchange.HttpProxy.ProxyRequestHandler.InternalBeginCalculateTargetBackEnd(AnchorMailbox& anchorMailbox) at Microsoft.Exchange.HttpProxy.ProxyRequestHandler.<BeginCalculateTargetBackEnd>b__278_0() at Microsoft.Exchange.Common.IL.ILUtil.DoTryFilterCatch(Action tryDelegate, Func`2 filterDelegate, Action`1 catchDelegate) at Microsoft.Exchange.HttpProxy.ProxyRequestHandler.CallThreadEntranceMethod(Action method)
Request information: Request URL: https://publicip/ecp/pentest.js Request path: /ecp/pentest.js User host address: User: Is authenticated: False Authentication Type: Thread account name: NT AUTHORITY\\SYSTEM
Thread information: Thread ID: 8 Thread account name: NT AUTHORITY\\SYSTEM Is impersonating: False Stack trace: at Microsoft.Exchange.Data.ApplicationLogic.Cafe.BackEndServer.FromString(String input) at Microsoft.Exchange.HttpProxy.BEResourceRequestHandler.ResolveAnchorMailbox() at Microsoft.Exchange.HttpProxy.ProxyRequestHandler.InternalBeginCalculateTargetBackEnd(AnchorMailbox& anchorMailbox) at Microsoft.Exchange.HttpProxy.ProxyRequestHandler.<BeginCalculateTargetBackEnd>b__278_0() at Microsoft.Exchange.Common.IL.ILUtil.DoTryFilterCatch(Action tryDelegate, Func`2 filterDelegate, Action`1 catchDelegate) at Microsoft.Exchange.HttpProxy.ProxyRequestHandler.CallThreadEntranceMethod(Action method)
Custom event details:
","body@stripHtml({\"removeProcessingText\":false,\"removeSpoilerMarkup\":false,\"removeTocMarkup\":false,\"truncateLength\":200})@stringLength":"213","kudosSumWeight":0,"repliesCount":0,"postTime":"2021-12-21T05:59:13.503-08:00","lastPublishTime":"2021-12-21T05:59:13.503-08:00","metrics":{"__typename":"MessageMetrics","views":890},"visibilityScope":"PUBLIC","placeholder":false,"originalMessageForPlaceholder":null,"entityType":"BLOG_REPLY","eventPath":"category:Exchange/category:products-services/category:communities/community:gxcuf89792board:Exchange/message:2254617/message:3043540","replies":{"__typename":"MessageConnection","pageInfo":{"__typename":"PageInfo","hasNextPage":false,"endCursor":null,"hasPreviousPage":false,"startCursor":null},"edges":[]},"customFields":[],"attachments":{"__typename":"AttachmentConnection","edges":[],"pageInfo":{"__typename":"PageInfo","hasNextPage":false,"endCursor":null,"hasPreviousPage":false,"startCursor":null}}},"User:user:807082":{"__typename":"User","id":"user:807082","uid":807082,"login":"kbegg00","biography":null,"registrationData":{"__typename":"RegistrationData","status":null,"registrationTime":"2020-09-24T02:26:01.116-07:00"},"deleted":false,"email":"","avatar":{"__typename":"UserAvatar","url":"https://techcommunity.microsoft.com/t5/s/gxcuf89792/m_assets/avatars/default/avatar-3.svg?time=0"},"rank":{"__ref":"Rank:rank:37"},"entityType":"USER","eventPath":"community:gxcuf89792/user:807082"},"ModerationData:moderation_data:2656420":{"__typename":"ModerationData","id":"moderation_data:2656420","status":"APPROVED","rejectReason":null,"isReportedAbuse":false,"rejectUser":null,"rejectTime":null,"rejectActorType":null},"BlogReplyMessage:message:2656420":{"__typename":"BlogReplyMessage","author":{"__ref":"User:user:807082"},"id":"message:2656420","revisionNum":1,"uid":2656420,"depth":1,"hasGivenKudo":false,"subscribed":false,"board":{"__ref":"Blog:board:Exchange"},"parent":{"__ref":"BlogTopicMessage:message:2254617"},"conversation":{"__ref":"Conversation:conversation:2254617"},"subject":"Re: Released: April 2021 Exchange Server Security Updates","moderationData":{"__ref":"ModerationData:moderation_data:2656420"},"body":"
Just for confirmation, do I need to install Microsoft Exchange 2016 CU21 Security Update 1 on our Edge Transport Servers in the DMZ?
Regards,
Keith
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Has anyone running Exchange 2013 noticed their eDiscovery is broken after the April update? We've been running on the April update since right after it was released but just today I went to run a new eDiscovery and I am now getting an Error 400 Bad Request error for just those functions. The last time I ran one of these searches was just before the update so it seems to be related to the patch. Any thoughts?
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after not hearing from you for so long I finally applied security path of April 13th on my staging and production Exchange 2019 CU9 this Thursday and everything works fine.
One common event warning I noticed before and after applying the patch is this. If you anyone experienced the same then please update.
Event code: 3005 Event message: An unhandled exception has occurred. Event time: 5/22/2021 7:46:56 AM Event time (UTC): 5/22/2021 3:46:56 AM Event ID: c2abd3c344584b7599413857078a5301 Event sequence: 6 Event occurrence: 5 Event detail code: 0
Process information: Process ID: 812 Process name: w3wp.exe Account name: NT AUTHORITY\\SYSTEM
Exception information: Exception type: ArgumentException Exception message: Invalid input value Parameter name: input at Microsoft.Exchange.Data.ApplicationLogic.Cafe.BackEndServer.FromString(String input) at Microsoft.Exchange.HttpProxy.OwaResourceProxyRequestHandler.ResolveAnchorMailbox() at Microsoft.Exchange.HttpProxy.ProxyRequestHandler.InternalBeginCalculateTargetBackEnd(AnchorMailbox& anchorMailbox) at Microsoft.Exchange.HttpProxy.ProxyRequestHandler.<BeginCalculateTargetBackEnd>b__278_0() at Microsoft.Exchange.Common.IL.ILUtil.DoTryFilterCatch(Action tryDelegate, Func`2 filterDelegate, Action`1 catchDelegate) at Microsoft.Exchange.HttpProxy.ProxyRequestHandler.CallThreadEntranceMethod(Action method)
Request information: Request URL: https://85.68.45.35:443/owa/auth/x.js Request path: /owa/auth/x.js User host address: 192.168.1.1 User: Is authenticated: False Authentication Type: Thread account name: NT AUTHORITY\\SYSTEM
Thread information: Thread ID: 121 Thread account name: NT AUTHORITY\\SYSTEM Is impersonating: False Stack trace: at Microsoft.Exchange.Data.ApplicationLogic.Cafe.BackEndServer.FromString(String input) at Microsoft.Exchange.HttpProxy.OwaResourceProxyRequestHandler.ResolveAnchorMailbox() at Microsoft.Exchange.HttpProxy.ProxyRequestHandler.InternalBeginCalculateTargetBackEnd(AnchorMailbox& anchorMailbox) at Microsoft.Exchange.HttpProxy.ProxyRequestHandler.<BeginCalculateTargetBackEnd>b__278_0() at Microsoft.Exchange.Common.IL.ILUtil.DoTryFilterCatch(Action tryDelegate, Func`2 filterDelegate, Action`1 catchDelegate) at Microsoft.Exchange.HttpProxy.ProxyRequestHandler.CallThreadEntranceMethod(Action method)
Custom event details:
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Corbett_Endersnot afaik, the suggested solution is 'don't use a $' atm I think. Because that's in part what was causing the free busy problem and the workaround/fix is federation OR use dedicated svc account instead of computernames with $ at the end
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How does one access Microsoft Exchange Developer Support? I tried opening a developer case using all of our MS Silver Partner avenues and could not get the right answer.
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Has there been a fix to administrating Exchange using an account with $ at the end of the username?
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Workaround fixed it for us as well, great. Because federation wasn't an option.Thx
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I was suspecting that once the account that being authenticate in cross forest is the exchange server computer name$ and thats the reason we get the 401 unauthorized. Once i changed to UseServiceAccount $false instead to $true it WORKS!
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