If you are running Windows NT/W2k there are several Performance Monitor
counters which will give you some insight into what may be causing your
problems. This is the cheapest, and many times effective, tool for
situations such as yours. It may not hand you the answer in point & click
fashion but, it gets the job done.
Steve
-----Original Message-----
From: lsellers [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, February 21, 2001 5:40 PM
To: CF-Talk
Subject: RE: AOL Cache servers bringing down server?
> 3) So why are these connections hanging around?
>
> Well this part of my knowledge is a bit shaky. Basically clients enter
> the TIME_WAIT state after and active connection closes. I guess it is
> time to stand on the shoulders of others ... MS knowledge base article
> Q137984 has the following paragraph about this condition:
>
> NOTE: It is normal to have a socket in the TIME_WAIT state for a long
> period of time. The time is specified in RFC793 as twice the Maximum
> Segment Lifetime (MSL). MSL is specified to be 2 minutes. So, a socket
> could be in a TIME_WAIT state for as long as 4 minutes. Some systems
> implement different values (less than 2 minutes) for the MSL.
The proper (soft) closing of a socket generally involves initiating a
shutdown sequence where the connection lingers around for a while to make
sure everything that was meant to be sent actually gets there. A lot of
people (myself included) have a tendacy to do an immediate hard closure of
the socket though. Less hassle.
That they linger around means the some coder somewhere probably has read a
few tcp books and knows what they're doing. :)
> 4) Why is your web server not serving up some images ?
>
> I have no idea. But having these 200 connections from AOL doesn't sound
> like a cause for alarm if your site gets some good traffic. These
> connections most likely aren't killing your server.
Hrm. Sounds a bit like the server is getting hammered. It's socket queue is
being exhausted. It's timing out in the middle of transfers. etc. That's
just a guess though.
--min
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