Network problems

  • Thread starter Thread starter August Startz
  • Start date Start date
A

August Startz

On one of our Windows 2000 servers we are having a big
problem with it sending out Thousands of TCP packets every
second and flooding the network.

This server, also our exchange server, has been running
fine for about 18 months, then all of a sudden this
started. Once we reboot it it will run for anywhere
between 45 minutes and 8 hours before it starts again.

I have ran virus scan, nothing was found, I installed the
network cards, but that did not help. I have looked at
netstat when this is happening but nothing looks out of
order. Does any one have any ideas?
 
we have a similar problem with our exchange server.
seems like our virus scanner slows down the server when it receives a bunch
of spam.
check task manager to see which process is taking up cpu time.
 
Have you scanned you machine to make sure it doesn't have
some sort of trojan,rogue ftp, backdoor, etc.

Antivirus won't always catch these.

look for a tool called fport and run that on you machine.

it will trace any open port UDP/TCP back to its executable

you might find something funny.

HTH
 
In
August Startz said:
On one of our Windows 2000 servers we are having a big
problem with it sending out Thousands of TCP packets every
second and flooding the network.

This server, also our exchange server, has been running
fine for about 18 months, then all of a sudden this
started. Once we reboot it it will run for anywhere
between 45 minutes and 8 hours before it starts again.

I have ran virus scan, nothing was found, I installed the
network cards, but that did not help. I have looked at
netstat when this is happening but nothing looks out of
order. Does any one have any ideas?
Click to expand...

In addition to the other responses, curious how did you determine that
thousands of TCP packets are flooding the network? Netmon or some other
capture? If so, can you let us know what type of packets they are, source
and destination addresses, and what port(s) they are using?

Thanks

--
Regards,
Ace

Please direct all replies ONLY to the Microsoft public newsgroups
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and confers no rights.

Ace Fekay, MCSE 2003 & 2000, MCSA 2003 & 2000, MCSE+I, MCT, MVP
Microsoft Windows MVP - Windows Server - Directory Services

Security Is Like An Onion, It Has Layers
HAM AND EGGS: A day's work for a chicken;
A lifetime commitment for a pig.
 
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