client sending tcp resets

Unanswered Question
Sep 11th, 2007
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update

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i guess the client is just doing what it is suppose to do when you have a routing loop and the client is getting a syn instead of a syn-ack

case closed :)

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I have a recently created FWSM context. Currently i have a rule says.

"any host x.x.x.x any". I am able to send udp or icmp to that host but any attempts to send tcp to that host results in a tcp reset being sent from the client. example


(inside host) tcp ftp syn

(outside host) tcp ftp ack

(inside host) tcp ftp rst


then the outside host tries to complet the connection build, but its rejected by the firewall because the connection is no longer in the state table.

This happens with any client that I use on this firewall context. also if I move this client to another firewall context this does not happen. has anyone seen this behavior before? what causes the client to send the tcp reset?


FWSM Firewall Version 3.1(4) <context>

Device Manager Version 5.0(2)F


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rajbhatt Wed, 09/12/2007 - 23:09
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Hi,

What type of ftp are u trying to do ?

the client is located in the inside and the server is located at the outside .


Have u got the fixups enabled or diabled ?

if it is disabled this can be a cause for the problem

To check for detailed info have u run the captures on the firewall ?

Also have u checked the syslog messages at the debugging level? It might give u an idea why the cleint is sending the reset message ?


Raj



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