Azure AD Health Failing
I am on the latest version of Azure AD Connect (2.5.79.0)... There are no network/DNS/connectivity issues at our site, it seems to me that Azure AD Health Service is having trouble because the endpoint is experiencing a service issue.. Is anyone else having the same problem with failure alerts/etc? I checked by running "Test-MicrosoftEntraConnectHealthConnectivity -Role SYNC" command, the stack trace throws an undocumented error number and complains of rate limiting issues... smells like the server is being overwhelmed or there are other issues slowing down the endpoint/service with the consequence that connections are piling up causing this error: Connectivity Test Step 1 of 2: Testing dependent service endpoints begins ... AAD CDN connectivity is skipped. Connecting to endpoint https://login.microsoftonline.com Endpoint validation for https://login.microsoftonline.com is Successful. Connecting to endpoint https://s1.adhybridhealth.azure.com/providers/Microsoft.ADHybridHealthService/diagnostics/version Endpoint validation for https://s1.adhybridhealth.azure.com/providers/Microsoft.ADHybridHealthService/diagnostics/version is Successful. Connectivity Test Step 1 of 2 - Testing dependent service endpoints completed successfully. Connectivity Test Step 2 of 2 - EventHub data upload procedure begins ... Tenant Id is successfully collected during agent registration. Server rejected Eventhub data upload, here is the exception: Microsoft.ServiceBus.Messaging.ServerBusyException: The request was terminated because the entity is being throttled. Error code : 50002. Sub error : 101. Please wait 4 seconds and try again. To know more visit https://aka.ms/sbResourceMgrExceptions and https://aka.ms/ServiceBusThrottlingS:N:ADHSPRODWUSEHSYNCIA:EVENTHUB:ADHSPRODWUSEHSYNCIA~22527,CL:30,CC:32,ACC:356250,LUR:WinEnd,LUT:2025-10-08T03:03:12.2035867Z,RC:1 TrackingId:<<< anonymized tracking ID>>> 0, SystemTracker:adhsprodwusehsyncia:eventhub:adhsprodwusehsyncia~22527, Timestamp:2025-10-08T03:03:13 at Microsoft.ServiceBus.Common.ExceptionExtensions.ThrowException(Exception exception) at Microsoft.ServiceBus.Common.AsyncResult.End[TAsyncResult](IAsyncResult result) at Microsoft.ServiceBus.Messaging.EventHubSender.Send(EventData data) at Microsoft.Identity.Health.AgentV1.ConfigurationPowerShell.TestAzureADConnectHealthConnectivity.TestInsightServiceDataUploadProcedure() Azure AD Connect Health agent could not communicate to the Health Service using port 5671. As a result, agent communication will fall back to use port 443, but use of port 5671 is recommended. Please allow outbound communication using port 5671. Tenant Id is successfully collected during agent registration. Server rejected Eventhub data upload, here is the exception: Microsoft.ServiceBus.Messaging.ServerBusyException: The request was terminated because the entity is being throttled. Error code : 50002. Sub error : 101. Please wait 4 seconds and try again. To know more visit https://aka.ms/sbResourceMgrExceptions and https://aka.ms/ServiceBusThrottlingS:N:ADHSPRODWUSEHSYNCIA:EVENTHUB:ADHSPRODWUSEHSYNCIA~22527,CL:30,CC:32,ACC:356837,LUR:IncomingUsage_ADHSPRODWUSEHSYNCIA-5,LUT:2025-10-08T03:03:54.9448143Z,RC:1 TrackingId:<<< anonymized tracking ID>>>, SystemTracker:adhsprodwusehsyncia:eventhub:adhsprodwusehsyncia~22527, Timestamp:2025-10-08T03:04:00 at Microsoft.ServiceBus.Common.ExceptionExtensions.ThrowException(Exception exception) at Microsoft.ServiceBus.Common.AsyncResult.End[TAsyncResult](IAsyncResult result) at Microsoft.ServiceBus.Messaging.EventHubSender.Send(EventData data) at Microsoft.Identity.Health.AgentV1.ConfigurationPowerShell.TestAzureADConnectHealthConnectivity.TestInsightServiceDataUploadProcedure() Azure AD Connect Health agent could not communicate to the Health Service using port 5671. As a result, agent communication will fall back to use port 443, but use of port 5671 is recommended. Please allow outbound communication using port 5671.
Why are Microsoft Data Centres logging in to my Office 365 accounts? Activity Alerts - BAV2ROPC
Hello, I have an activity alert set up to email me whenever a log in is detected from one of my 12 office 365 email users. These emails contain the username logging in and the IP address the log in originated from. Until the end of 2019, all IP addresses were expected, either being that of the office, the Vodafone mobile network or the home addresses of the sales guys. In 2020, I have started getting log in alerts, which according to https://whatismyipaddress.com/ are from Microsoft Datacentres in Ireland, Holland and Austria, all with "Microsoft Corporation" as the ISP and sometimes with the same for the Organisation and sometimes with "Microsoft Azure". e.g 40.101.88.221 (Amsterdam), 40.101.102.149 (Dublin). Worried about potential breaches, I contacted Microsoft Support (who by the way are always ON IT, thank you) who helped me find info in the audit log to say the User Agent is BAV2ROPC, which lead me to this page https://www.reddit.com/r/Office365/comments/bl90gw/bav2ropc_user_agent_in_logs/ where someone's found it means "Business Apps v2 Resource Owner Password Credential", which is apparently the User Agent for an updated version of Outlook Mobile. I have a couple of questions / observations and wondered if anyone could shed any light on this. 1) My users don't know their passwords so it's highly unlikely they've been phished, so I don't think these are breaches. 2) My email account has triggered log ins from Microsoft IP addresses, and I have 2 factor authentication turned on where I received a text message code to my mobile. I have not received texts in relation to these logins, so again I don't think it's a breach. 3) I don't use Microsoft Outlook on my mobile, so don't think I'd be generating this BAV2ROPC user agent (but I am on the Activity Alerts). 4) If it was a device I was using causing this user agent, why aren't the Activity Alerts logging my IP address from my device's location? 5) My account is used to sign in programatically in a piece of software I wrote, so that could explain it for my account, but I'm also getting alerts for users who only access their email on their android phone on the built in email app. 6) The frequency I'm receiving Activity Alerts from Microsoft IP addresses is increasing. I get a few a day now. In summary, I don't think there's anything untoward goin on, but as a responsible admin, I'ld like to understand exactly what's occuring. Many thanks, Dave
