Re: Event 4226 issue - TCP half open connection limits.
- From: "Alexander Nickolov" <agnickolov@xxxxxxxx>
- Date: Thu, 5 Jan 2006 18:29:10 -0800
It's probably not what you expected to hear, but consider
writing your scanner under Linux...
--
=====================================
Alexander Nickolov
Microsoft MVP [VC], MCSD
email: agnickolov@xxxxxxxx
MVP VC FAQ: http://www.mvps.org/vcfaq
=====================================
"George Sidor" <sidorg@xxxxxxxxxxxxxxxxx> wrote in message
news:eD4q70ECGHA.3584@xxxxxxxxxxxxxxxxxxxxxxx
> My question is twofold.
>
> 1) Can I get around this 10 half open connection limitation in XP SP2 in
> a official MS manner? That is, without hacking TCPIP.sys to increase the
> limit?
> 2) Does Windows 2003 Server have this TCP half open connection limit as
> well?
>
> Some background:
> My company just encountered this issue relating to max limit of 10 half
> open TCP connections. We have a software product marketed for enterprise
> IT, which allows the admin to obtain use our software console application
> to get the status from hundreds or thousands of PC's running our agent
> software.
>
> In order to allow us to scan hundreds or thousands of systems in a
> reasonable amount of time, we open a max of 250 simultaneous TCP to 250
> different PC's at a time. If there are more systems, we queue up the
> requests.
>
> We just noticed recently the extreme slowdown of system scanning on a XP
> SP2 system running our monitoring console. Before, scanning hundreds of
> systems took maybe 5 to 10 seconds tops. Now, unless we greatly increase
> our timeout values per system scanned to around 240 seconds, we get
> results of 18 to 20 systems that respond to our requests, and the rest
> show network timeout.
>
> The the problem does not show up in XP SP1 or before.
>
>
.
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