Re: Slow internet connections after XP SP2 update
From: Brock Buss (brock_at_bbuss.net)
Date: 12/30/04
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Date: Thu, 30 Dec 2004 13:15:31 -0700
Yeah, Skype and XP SP2 don't really play together well. I had a user
with identical internet/network speed issues who uses Skype when he
travels to Europe and Asia, cuts down on his phone bills... So, yeah,
Skype likely was the culprit in this case.
markp wrote:
> I had a problem with a slow internet XP system after an SP2 update on my
> laptop which was subsequently fixed, this post is for information purposes
> for those who may be googling for an answer to their problems!
>
> I use a proxy server to get to the internet, and there is no other way of
> accessing the internet from my local network. One of the clients, a WinXP
> laptop machine, was upgraded to SP2. The laptop was then very slow at
> accessing mail or browsing the internet - sometimes pages would partially
> download or not at all, and would take a very long time to do so.
>
> The first thing I did was a netstat from the command prompt on the client,
> and found that there were several half open connections to internet
> addresses being created. Netstat also took some time to complete. I googled
> and found that SP2 limits simultaneous half open connections to 10 before
> throttling further requests, this is not a registry setting but hard coded
> into the TCPIP.SYS file. The idea is to stop the spread of worms and the
> like (and conspiracy theories abound about P2P programs being throttled
> abound), but without limiting legitimate accesses.
>
> Since netstat was slow to complete and showed half open connections actually
> in the process of being created, I thought that there could be applications
> on the laptop requesting internet access, and the 10 limit was exceeded
> thereby throttling further accesses. This was confirmed by a look at the
> system event log (right click on My Computer -> Manage -> Event Viewer ->
> System) which showed a yellow warning triangle with a new Event ID 4266:
> TCP/IP has reached the security limit imposed on the number of concurrent
> TCP connect attempts.
>
> So I installed ZoneAlarm (www.zonealarm.com) to catch whichever applications
> were doing this and block them. I had things like Skype and other apps all
> trying to find updates all at once. Since these were on the local network
> they were all half open requests which could never complete. By blocking
> these the 4266 error disappeared. Also I increased the limit of simultaneous
> half open connections to 50 using this little utility:
>
> http://www.lvllord.de/?lang=en&url=tools
>
> After all that my SP2 udated laptop is running very smoothly with fast
> internet access.
>
> HTH!
>
> Mark.
>
>
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