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[FW1] VPN between firewall ftp packets dropped



I have set up vpn between 2 site . Site 1 firewall is running ipso 3,3 fw
ver 4.1 sp3 with flows disabled.
2nd Site firewall is running ipso 3.2.1 , fw  ver. 4.1 sp2 . I am having
following problems


                       ________
_______ 
    client---------| firewall1 |------------------------------------|
firewall2|--------ftpserver
    Site1           -------------
-----------             Site2

We are trying to ftp from a client in site 1 to site 2. Since ftp server is
trying some sort of reverse look up on client 
the response is delayed.When ftp server replies  I see packets being dropped
by the firewall at site 1(firewall-1)with 
error message unknown established packet in the firewall log. My  tcp
session time out is more than an hour.The
ftp session fails.


Have anybody seen problem like this. Any suggestions appreciated

Prashanth


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