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We have managed to get OWA and ActiveSync email working through UTM 9.509-3, which connects to Exchange Server 2016. We have set the authentication mode to 'form' and the real webserver mode to 'basic' but it doesn't pass the logon details, we then get the Exchange OWA logon screen and have to re-enter our logon credentials. On the Exchange Server we have enabled basic authentication. Has anyone managed to get it pass the logon details? It's not the end of the world but annoying for people to have to double logon.
Did you follow https://community.sophos.com/kb/en-us/131787 ?
In reply to Alexander Busch:
I did yes. In that article in does not mention how you configure the reverse authentication.
In reply to MJG:
Do you use authentication against AD or LDAP?
Another point is the form of the credentials. What form is required for your exchange, UPN? And at Sophos you use just a user name?
That could be a mismatch of the format of the credentials
In Exchange you can set the format of the logon credentials:
Set-OwaVirtualDirectory „owa (Default Web Site)“ -LogonFormat Username -DefaultDomain domain.local
After that restart IIS:iisreset
We use AD for authentication. Exchange has been set to: username and password, this is how users then login from Sophos.