Thursday, March 31, 2005

XP2 - Web connectivity loss

Since reinstalling XP on my box at home, I've been suffering from an intermittent loss of web connectivity. Not that the whole internet falls over - remote desktop, email, newsgroups and so on still work - it's just web access that dies horribly.

After a fair bit of hunting, it seems as though this is related to a known "feature" of SP2 - according to Microsoft, some 5% of users will experience this problem. It's caused by various packets getting lost in the NAT system between my PC and my router. So, if I go back to a direct ADSL connection, this should cease to be a problem. But if I want to use a home network, the problem will persist.

So I'm trying a fix - a quick registry hack:

the registry key that must be added is as follows (without the brackets):

[HKLM\System\CurrentControlSet\Services\IPSec\AssumeUDPEncapsulationContextOnSendRule = REG_DWORD]. The value data should be set to equal 2. In an e-mail, Mitchell noted that “You can reset the behavior to Default SP2 by changing the Value to “0”. A value of “1” will only enable a Client with a public (i.e.non-NAT’d) address to connect to a NAT’d server. The value of “2” enables both public and NAT’d clients to connect to a NAT’d server. The value of “2” is equal to the pre-SP2 behaviour.


Post a Comment

<< Home