Do I need to be worried: TCP/IP has reached the security limit imposed on the number of concurrent TCP connect attempts

I have a few clients that I manage and find that they are getting these errors in there system. TCP/IP has reached the security limit imposed on the number of concurrent TCP connect attempts

Some are only part of a 5-6 user network and they are on XP Pro SP3. After reading it looks like it is because network comptuers are trying to connect. I don't think there are network computers trying to connect. I have scanned with Malwarebytes and Vipre virus software and no infections have been found.
Is there any tool that can look for any bit torrent files?
How can I tell if it is just the network computers trying to access the computer?
calitechAsked:
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da3veCommented:
It depends on what the machines are being used for. You can use the netstat command to see what/how many ports are open on a particular client. Do a netstat-a to display all connected ports. It might be that the machines are trying to connect to a service that is no longer available. It might be a application like Trend Micro's firewall product that is generating a lot of loopback connections. Start there and see if anything is unusual.

See also this article for more info about the TCP/IP connection attempts:
http://smallvoid.com/article/winnt-tcpip-max-limit.html

If you are running a software firewall, you should be able to see incoming connection attempts in the firewall log. You may have to turn on a higher logging or debug level to see connection attempts.

When you say "look for bit torrent files" do you mean "see if there is bit torrent traffic on the network"? Yes there are tools to do this. But because it sounds like a small network, it might be easier to look at port utilization on a switch or on the individual machines to see who is moving a lot of data.

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calitechAuthor Commented:
Thanks guys. I monitor a bunch of computers from different companies and this error seems to pop up on a lot of them, so I am checking them out now.
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