Hi,
i need to setup a Hybrid Szenario with Exchange 2019 OnPremise and Exchange Online.
I run the HCW and the setup is fine.
I can send mails from external domains to Exchange Online and from Exchange Online to Exchange OnPremise clients.
But i can´t send mails from Exchange onPremise through a smarthost.
The smarthost [192.168.0.254] is a XGS2100 with 18.5.2.
Exchange OnPremise Eventlogs shows
Outbound TLS authentication failed with error SubjectMismatch for Send connector Outbound to Office 365 - 3j5k6j3k-53e4-45b4-8187-482ad2d5bcc3.
The TLS authentication mechanism is DomainValidation. Target is [192.168.0.254].
If i disable TLS in XG 18.5.2 i get this error
Send connector Outbound to Office 365 - 3j5k6j3k-53e4-45b4-8187-482ad2d5bcc3 couldn't connect to remote domain [192.168.0.254].
The send connector requires Transport Layer Security (TLS) authentication, but is unable to establish TLS with the receiving server for the remote domain.
Check this connector's authentication setting and the EHLO response from the remote server mail.domain.de.
What setting do i need in XG ?
Has anyone used Sophos XG with a Hybrid Exchange Setup?
Thanks
Jürgen
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