06-09-2010 04:30 AM - edited 03-11-2019 10:56 AM
Hi folks,
I am experiencing garbled telnet sessions on port 25 to ms-exchange servers on the other side of an ASA5520.
This is an MS "basic check" for inter-server email comms, but is proving problematic.
SMTP is permitted through the ASA.
Suggestions welcomed, please!
Regards,
Andy.
Solved! Go to Solution.
06-09-2010 04:53 AM
Hi Andy,
SMTP is open by an ACL?
Are you inspecting SMTP or ESMTP through? This traffic passes the inspection fine?
Federico.
06-09-2010 04:53 AM
Hi Andy,
SMTP is open by an ACL?
Are you inspecting SMTP or ESMTP through? This traffic passes the inspection fine?
Federico.
06-09-2010 05:47 AM
Federico,
Yes, there's an acl permitting smtp, and "inspect ESMTP" is in the config.
From other forums I gather that this might be the issue.
Regards,
Andy.
06-09-2010 06:15 AM
Folks,
I have "fixed" the issue by "no inspect ESMTP".
I'm about to check whether this is a known cisco issue.
Thanks, Federico.
Regards,
Andy.
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