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After Exc 2019 Cu15 update Outlook problem
After the Exchange 2019 CU15 update, Outlook 2016 or Outlook 2021 keeps asking for a password. When I check the operating systems, I see that they are versions up to Windows 10 Pro 1607 and 22H2. I wonder if there is a feature that affects older operating systems? Do you have any ideas?
Hello, our problem is solved.
It was enough to change the Network Security: LAN Manager authentication level setting to Send NTLMv2 response only.
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The support matrix that you can use to validate:
Exchange Server supportability matrix | Microsoft Learn
For password prompts there can be multiple scenarios, please have a look at those links to try to troubleshoot:
1. Outlook continually prompts for password when you try to connect to Microsoft 365 - Outlook | Microsoft Learn
2. Microsoft Exchange - Keep asking for password - Microsoft Community3. Upgrade Exchange to the latest Cumulative Update | Microsoft Learn
4. Error message when upgrading Cumulative Updates in Exchange | Microsoft Learn
Hello, our problem is solved.
It was enough to change the Network Security: LAN Manager authentication level setting to Send NTLMv2 response only.
