Web Marshal Browsing Issue

Hi There,

We have a client who has recently moved their web marshal to a new server. Usually things go well but sometime when a user tries to connect to the internet via web marshal they get a page cannot be displayed. The only way to get them browsing again is to log them off and back onto the machine then the internet goes fine. Has anyone seen anything similar ? any ideas or advice would be greatly appreciated.
CodeBlueEngineersAsked:
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gheistCommented:
Is "New Server" running exactly same OS as "Old Server"?
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CodeBlueEngineersAuthor Commented:
Hello,

No the old server was windows xp professional, The new Server is running windows server 2003
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gheistCommented:
It is new advanced TCP features on 2003 that make your firewalls or other connection trackers in the path to kill connections. Feature to be disabled is "advanced window scaling"
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CodeBlueEngineersAuthor Commented:
Hello, Where abouts do i disable this feature ?
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gheistCommented:
http://en.wikipedia.org/wiki/TCP_window_scale_option#Possible_side_effects
links below.
There could be problems with SACK and PMTU options with strange routers also.
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CodeBlueEngineersAuthor Commented:
Hi there,

I have attempted to disable advanced winow scaling and we still get the issue. it appears to be less frequant bit still happens for some user several times per day
Any more ideas.?
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gheistCommented:
It is something about TCP options.
You can try Microsoft Network Monitor, and have a look at options in SYN and ACK packets, and use registry settings to remove unusable ones. Yes - a lot of rebooting and trial/error - I cannot make informed guess for some particular firewall.
sometimes it is PMTU (DF option) , sometimes Window size as such, sometimes SACK, and basically whatever.
If you still have your hands at old installation - you can dump it's TCP negotiation to get better ideas what was the change that breaks stuff.
Also have a look at event log for strange things - at least Vista limits outgoing connection rate for process, I am sure 2003 not, but who knows.
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CodeBlueEngineersAuthor Commented:
Hello,

I have discovered that it is a rougue DHCP that is giving some clients a funny DNS addresss which i am currently investigating the networking side.
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