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Old 03-25-2015, 01:04 AM   #1
NM04
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host computer hangs in my network


Dear Experts,
In my network there must be around 3k to 5k or may be more users, from past few days these computer are getting hanged and as soon as I unplug the network cable they are back to normal. all are behind a proxy. Any idea what's happening?? Help is always appreciated!!

regards,
 
Old 03-26-2015, 04:22 AM   #2
dijetlo
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Quote:
as soon as I unplug the network cable they are back to normal.
I think we may be struggling a bit with language here and I very much appreciate your efforts with English, but do you mean that when you reset (unplug and then plug back in) the cable the users regain access to the internet via the proxy?
And we're talking about the LAN cable on the proxy, right?

These are just wild guesses but
3 to 5 thousand users going through one proxy server might be generating more traffic than you can handle:

1: Check for maximum concurrent connections in the proxy configuration file. Run a "netstat -tapn" and make sure you're not hitting the limit.

2:The proxy may be thrashing, try running an "htop" command on the proxy. You're looking for swap memory being accessed a lot and the processor utilization being at or near 100 while the users are unable to access the proxy.

Last edited by dijetlo; 03-26-2015 at 05:15 AM. Reason: because everybody struggles with English. Especially Americans.
 
Old 03-26-2015, 05:35 AM   #3
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LAN cable at users end, users systems are getting hanged, when I pull the LAN cable from users systems they come out of that (hanged)(halted) situation, at this time their CPU & physical memory consumption is between 90-100%. I presumed it to be some kind of malware activity in the network. I am still investigating what could be causing this!!
 
Old 03-26-2015, 06:20 AM   #4
dijetlo
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The choke point sounds like the proxy server or your cable (you might want to look at saturation over that segment, that's a lot of traffic for one wire).
 
Old 04-15-2015, 03:11 AM   #5
Bruce783
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Are all of these five thousand computers on the same subnet?

Install a packet sniffer and attempt to gather some network traffic.
 
Old 04-15-2015, 11:58 PM   #6
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no different subnets, I did captured traffic and analyzed it but still nothing.
 
  


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