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[FW-1] Decreasing tcpendtimeout



Hello everyone,  I have problems with windows NT 4.0  PCs trying to print
documents using a remote printer (HP jetdirect + LaserJet 1200)  across the
firewall (Check Point VPN1 NG  FP1) with  Microsoft LPD/LPR printer
protocol (port 515). We found  that the print application  will frequently
close connections, and then in less than 50 seconds, it will try to open
them again, causing "Syn for established connection" droped packets. We
found that one solution is to decrease the default timer for half-closed
connections (tcpendtimeout) to a much smaller value than 50 seconds (p.e.
10 seconds).  We would like to know what are the risks or problems
associated with this change.

We have two Nokia IP330 appliances (IPSO 3.4.2) in cluster configuration
(VRRP) with Check Point VPN-1/Firewall-1 NG Feature Pack 1.

Thanks in advance for your help. Regards.

Italo Dacosta

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