Good day,
I have a very strange phenomenon in a customer installation.
Exchange Online takes a long time to start and hangs again and again when accessing shared mailboxes.
I have the same setup with other customers and there I have no such problems.
You can see in the Outlook connection status at "Authn" that it runs on error and after about 3 minutes it works. In the log everything is on green. All the exceptions for O365 are set. Also disabling all security features (web filter, AV scan, TLS/SSL) on a single computer do not bring any improvement. Only the change of the Internet connection without the Sophos XGS. e.g. Sophos UTM, cell phone hotspot or HomeOffice Internet access bring a success.
Microsoft Teams, for example, does not affect it.
I am running out of ideas what else I could try.
Maybe someone has another idea.
Thank you and many greetings
Alex
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