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New Member

FIN PSH ACK from an outside mail server

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?

3 REPLIES
Bronze

Re: FIN PSH ACK from an outside mail server

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

New Member

Re: FIN PSH ACK from an outside mail server

It is only happening when we send emails to the yahoo email server. The port on the yahoo mail server side is 25.

Bronze

Re: FIN PSH ACK from an outside mail server

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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