When you change AutoDiscover settings for users, it can take up to 2 hours until the cached data is invalidated and the new AutoD configuration is sent as a response to the new AutoD request.
You have to force a restart of an Exchange service and an Exchange IIS application pool to activate your configuration changes immediately:
- Service: MSExchangeServiceHost
- Application Pool: MSExchangeAutodiscoverAppPool
These restarts need to be performed on each modern Exchange Server (2013/2016/2019) in your infrastructure serving AutoDiscover requests.
Use the following two PowerShell cmdlets to simplify this task:
Get-ExchangeServer | ? { $_.AdminDisplayVersion -like '*15.*'} |
% { Invoke-Command -ComputerName $_.Name
-ScriptBlock {Restart-WebAppPool MSExchangeAutodiscoverAppPool } }
Get-ExchangeServer | ? { $_.AdminDisplayVersion -like '*15.*'} |
% { Invoke-Command -ComputerName $_.Name `
-ScriptBlock {Restart-Service MSExchangeServiceHost } }
Enjoy
