05-09-2003 08:41 AM - edited 03-09-2019 03:13 AM
I know that there was a problem with Cisco PIX and duplicate e-mail messages being received on an Exchange server.
There was a Cisco Caveat article, does anyone know what it is?
I know that the fix for the caveat was to simply upgrade the IOS to 6.2(3).
If anyone knows, I would greatly appreciate a reply.
Thanks!
05-09-2003 09:08 AM
Have you disabled smtp fixup?
no fixup protocol smtp 25
It doesn't play nice with MS's ESMTP implementation. I had similar behaviour to you with exchange 5.5 and it enabled
05-09-2003 09:32 AM
No, I didn't. In fact, someone at Cisco gave me a Caveat Article that addressed this exact behavior and recommended upgrading the IOS.
After upgrading the IOS to version 6.2(3), the problem has not resurfaced.
I am looking for the article as a colleague has asked for it.
Thanks!
05-09-2003 01:05 PM
Its not a IOS bug, I have been running 6.1.2 for over 11/2 years and I have never had that problem. I have run both 5.5 and Exch 2000 behind this firewall.
I also have always had the MailGuard (fixup smtp) enabled, so its not the problem.
05-09-2003 02:41 PM
A 'Cisco TAC' engineer identified the caveat...so I am not dreaming this up.
It doesn't happen to everyone.
...and I never said I was running 6.1.2 at the time either...so 6.1.2 probably doesn't have the problem...:^)
-Chris
05-09-2003 11:37 PM
Chris,
There is no fixup for ESMTP on the PIX as of yet. So, if you have:
fixup protocol smtp 25
Then, only 7 SMTP commands ( HELO, MAIL, RCPT, DATA, RSET, NOOP, and QUIT) are allowed.
ESMTP requires more commands.
Thats why either of the two things have to happen:
-Turn off smtp executing the following command:
no fixup protocol smtp 25
-Or, disable ESMTP on the Exchage Server .
Please refer to the following link on how to turn off ESMTP functionality:
http://www.microsoft.com/exchange/en/55/help/default.asp?url=/exchange/en/55
/help/documents/server/xog05031.htm
So, if the problem doesn't appear with Exchange and the MailGuard on the PIX then Exchange must be using SMTP.
I hope this helps. Thanks,
Mynul
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