FIN PSH ACK from an outside mail server

Unanswered Question
May 30th, 2007
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We are getting the following error messages on our ASA 5510 with the following information:


Inbound TCP connection denied from (yahoo mail server IP)/25 to (our outside IP)/15936 flags FIN PSH ACK on interface Outside


We also have a queue of email to yahoo accounts on our mail server. The queue does clear out eventually. Any ideas what is causing this problem and how to fix it?

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zulqurnain Wed, 05/30/2007 - 13:20
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hello,


is also happening when you send email to yahoo mail server, or is it only happening what emails coming from yahoo mail server..


HTH... please rate it

ddismore Thu, 05/31/2007 - 07:32
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It is only happening when we send emails to the yahoo email server. The port on the yahoo mail server side is 25.

zulqurnain Fri, 06/01/2007 - 02:46
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how are you publishing your email server to outside..


assuming like this:


access-list out_in permit tcp any host eq smtp

access-list out_in permit tcp any host eq pop3


access-list in_out permit tcp host any eq smtp

access-list in_out permit tcp host any eq pop3


static (inside,outside) tcp 25 25 netmask 255.255.255.255

static (inside,outside) tcp 110 110 netmask 255.255.255.255


access-group out_in in interface outside

access-group in_out in interface inside


or is there anyother way you have done it

HTH, please rate it.

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