Telnet garbled on smtp port via ASA

Answered Question
Jun 9th, 2010

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.

I have this problem too.
0 votes
Correct Answer by Federico Coto F... about 6 years 5 months ago

Hi Andy,

SMTP is open by an ACL?

Are you inspecting SMTP or ESMTP through?  This traffic passes the inspection fine?

Federico.

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Correct Answer
Federico Coto F... Wed, 06/09/2010 - 04:53

Hi Andy,

SMTP is open by an ACL?

Are you inspecting SMTP or ESMTP through?  This traffic passes the inspection fine?

Federico.

a.whiting Wed, 06/09/2010 - 05:47

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.

a.whiting Wed, 06/09/2010 - 06:15

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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