Had an issue with Exchange 2016 CU14 not allowing users to login, but administrators could login just fine.
Turns out the policies on the server were corrupted, and a full reset needed to be done to fix the issue.
Move Exchange Computer account to OU with Blocking Inherritance
RUN: RD /S /Q “%WinDir%\System32\GroupPolicyUsers”
RUN: RD /S /Q “%WinDir%\System32\GroupPolicy”
RUN: GPupdate /force
RUN: secedit /configure /cfg %windir%\inf\defltbase.inf /db defltbase.sdb /verbose
TEST you can connect to OWA ECP Outlook… it should work 🙂
Move your Exchange server Back to its normal out, then execute “gpupdate /force”
Confirm it still works, if not fix your Group Policies.
Maybe its this problem?
1.Click on Start/Run type secpol.msc.
3.Expand Local Policies -> Click on User Rights Assignment
4.In the right pane double click Access this computer from the network.
5.Click Add user or Group ->Type in Authenticated Users (by default only Administrators is entered)
6.Click Ok -> Click Ok
That should do it. You may need to reboot.