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8.0

Cisco ASA 5520 blocks SMTP when using TLS

Asked by Nikolaj77 in Email Protocols, Cisco PIX Firewall, Postfix

Tags: TLS, SMTP, postfix, cisco asa 5520

Hi,

We have a Cisco ASA 5520 in our setup and in the dmz we have a postfix server, where we have applied a certificate and configured postfix to use that certificate.

When connecting from outlook 2007 using TLS from the inside and to the postfix server in the dmz it works, but when connecting from the outside to the postfix server it does not work.

When going from outside to the postfix traffic is passing through the asa 5520, but when going from the inside to the postfix server traffic is passing through a PIX501.

The ASA is running:
Cisco Adaptive Security Appliance Software Version 7.0(7)
Device Manager Version 5.0(7)

This is our inspection policy:

class-map inspection_default
 match default-inspection-traffic
!
!
policy-map global_policy
 class inspection_default
  inspect dns maximum-length 512
  inspect ftp
  inspect rsh
  inspect sqlnet
  inspect xdmcp
  inspect netbios
  inspect tftp
policy-map policy_global
policy-map type
!
service-policy global_policy global
smtp-server <ip1> <ip2>
Cryptochecksum:xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx


We have also allowed traffic on port 25 and that works for non TLS traffic.


We really need TLS to be allowed through the ASA.

Can somebody help with an answer?

Thanks.
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[+][-]06/12/09 02:03 PM, ID: 24616157Accepted Solution

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About this solution

Zones: Email Protocols, Cisco PIX Firewall, Postfix
Tags: TLS, SMTP, postfix, cisco asa 5520
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Solution Provided By: 3nerds
Participating Experts: 2
Solution Grade: A
 
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