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SBS2008 Unseably slow Internet ... Yet OK When server not connected

Hi Experts,

I have had this recurring issue (nightmare really!)... Everything had been running fine on my SBS2008 network, but the last few days the Internet is slow to the point of being useless.

I purchased a new router and tried that just connected directly to a laptop... physical downstream 4064kbps (which is good for our location) speedtest.net returns 2.8mb (again which is nothing unexpected) ping time 105ms..... Plug the router into the network and it drops to 500+ on the ping and stop start web usage....

Any pointers?

Rich Weissler

Check task manager, and see if the volume of network traffic coming from the server is unusually high. If it is, from the command prompt, run 'netstat -aon', and see if you have an unexpectedly large number of connections.
(I saw something somewhat similar to this on an NT3.51 server and a 64kpbs line early in my career. A writable directory in the FTP server had been discovered by someone who was using the server to host unfortunate files for the day or so before it was cleaned up. Now, in 2010, I'd suspect malware or rootkit on the server.)

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StefanKamp

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leebakerpvmsupplies

ASKER

Hi Guys,

Thanks for your quick replies... All the machines are now off expect mine and the server. I have checked the network monitor on both and they are less than 0.05% traffic on them, and the mail queue is empty.

Netstat -aon output to a txt file returns 5000+ lines (is this usual?)

I have run Rootkit and AV scans on both machines (AVG network edition) - both all clear.

A little more info....

I had a major issue with BT six months agon, had loads of engineers here. after numerious tests and new lines etc, I tried a new router and the speed returned... even though I use that same router at home and my broadband flies! All had been fine for months but last month (not the same date - I logged it!) it went stupid slow again for 2 days and then just returned back to it's usual speed. It's been like this now for 2 working days.

Thanks again.
Lee

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