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alan-kerio

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the kerio product is winroute pro 4.2.5(os is win2000 sever with sp4,dns forwarder enabled and forward dns queries to specified dns servers);
index.php?t=getfile&id=1682&private=0

it has been running smoothly for over 6 years, but these two month, some times the client pc can not access internet and get the error "can not find server or dns error", So I use debug log to observe the status of dns forwarder and get below log:


WinRoute - Debug Log

------------------------------------------------------------ --------------------
[10/Aug/2009 10:48:04] conncheck: DNS query: www.pjtime.com has 210.51.188.41
[10/Aug/2009 10:48:05] conncheck: conn: connection retry, 2
[10/Aug/2009 10:48:05] conncheck: DNS forwarder 221.5.88.88 is reachable
[10/Aug/2009 10:48:05] conncheck: DNS query: idate1.163.com has 61.135.252.5
[10/Aug/2009 10:48:05] conncheck: DNS forwarder 221.5.88.88 is reachable
[10/Aug/2009 10:48:05] conncheck: DNS query: now.eloqua.com has 209.167.231.15
[10/Aug/2009 10:48:05] conncheck: DNS forwarder 221.5.88.88 is reachable
[10/Aug/2009 10:48:05] conncheck: DNS query: idate1.163.com has 61.135.252.5
[10/Aug/2009 10:48:05] conncheck: DNS forwarder 221.5.88.88 is reachable
[10/Aug/2009 10:48:05] conncheck: DNS query: idate1.163.com has 61.135.252.5
[10/Aug/2009 10:48:06] conncheck: DNS forwarder 221.5.88.88 is reachable
[10/Aug/2009 10:48:06] conncheck: DNS query: ae.natinst.com has 220.250.64.24
[10/Aug/2009 10:48:06] conncheck: conn: connection retry, 2
[10/Aug/2009 10:48:06] conncheck: conn: connection retry, 2
[10/Aug/2009 10:48:06] conncheck: conn: connection retry, 2
[10/Aug/2009 10:48:06] conncheck: conn: connection retry, 2
[10/Aug/2009 10:48:07] conncheck: DNS forwarder 221.5.88.88 is reachable
[10/Aug/2009 10:48:07] conncheck: DNS query: flashhq.gw.com.cn has 222.73.103.41
[10/Aug/2009 10:48:07] conncheck: conn: connection retry, 2
[10/Aug/2009 10:48:07] conncheck: conn: connection retry, 2

................

above dns server is provided by my ISP,I have try to use different dns servers of different ISP, but the dns connection still faild frequentlly.

I have try to use the option "forward dns queries to the server automaticaly selected from the dns servers known to the opearing system" , but the dns connection still faild frequentlly.



Please help me , I am in great trouble now.
Thanks

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[Updated on: Tue, 11 August 2009 05:28]

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