Exchange Server 2019 OWA web app when open calendar keep direct login page

Copper Contributor

After migrate all mailbox from Exchange 2013 to 2019, Outlook client / mobile app working fine. However when open OWA web app then go Calendar, may be wait for few second or click on any event, it will reload to login page. I can't see any error from event log or inetpub\logs\LogFiles. If owa IP address point back to Exchange 2013, web app calendar work again.


I tired add HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa\MSV1_0\BackConnectionHostNames with exch2019.domain.local, domain.local and autodiscover.domain.local didn't help.


The exchange server only allow access internally or by vpn connection.


Any idea about this? Thanks

2 Replies

Hi @ihsmove 

Did you changed the Virtual Directory to the new server.

I would highly recommend going through below article.  

Best Practices for Migrating from Exchange Server 2013 to Exchange Server 2019 - Microsoft Community...



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Hi RecepGencaslan

Thanks your update.

Yes all virtual directory set to and
both DNS record in internal DNS is exchange 2019 DAG ip address.

Since now having issue, DNS record fall back to exchange 2013 ip address.

will have a look on the article see any missing steps.