Hi all togehter,
having an Exchange 2019 on prem.
Our Outlooks are not able to connect anymore to our Exchange Server.
The Cert is valid, it includes all domainname and autodiscover.ourdomain.com
Connectivity Tests like:
are working well.
OWA is working absolutley perfect, no cert errors, no login issues.
Apps like Apple Mail, or Android Mail Apps are working and synching well.
The Only thing is that Outlook Asking ALLWAYS for credentials, and is not able to establish a connection.
Of course Username and Password is 100% typed correctly.
This happens on all Outlook clients within and from outside our org.
Tried on new Computers... all behave the same.
We're Having latest Outlook Clients from O365 Subscription.
I would appreciate any Help on this.
Who can give some HINTS where the Issue could be ?
thanks in adavance