Hi, I have two exchange servers 2013 on windows 2012, both with CAS and Mailbox database.
if I run Test-SmtpConnectivity from Exchange1 server to itself I got success on all connectors, but if I try the same command from Exchange2 to Exchange1 server I got error on ports 25, 717 and 587, the ports 2525 and 465 connects with success.
The details says: The server returned the following invalid SMTP banner: ""
If I try telnet the port 25 on Exchange1 server I get a blank screen and if I press any key on the keyboard it exits the telnet.
At this moment I have the firewall off, no Antivirus and still getting the same problem.
I also tried to remove and recreate the connector again but nothing changes.
Thanks