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Sloooooow Internet on SBS 2003

Posted on 2008-10-22
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Last Modified: 2013-12-14
We have had a Dell server running for about a year with no problems. Config as follows:
-Single NIC in use
-SBS Server2003 SP2, DHCP (NIC set to static IP) and DNS, DNS forwarder to external router.
-External Router with DSL and Static IP, DHCP disabled.
-12 Workstations.

This last Monday, the Internet was slow more or less useless. Tried the following:
-New router.
-Reconfigured DNS and DHCP.
-Connect modem directly to workstation and have proper speed (About 5.5 mb up and .6 mb down)
-If I take the server off the network, connected workstations Internet speeds up to acceptable.

No changes were made to the server or network over the weekend; Quite baffled, any ideas?
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Question by:Moron6969
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8 Comments
 
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Expert Comment

by:takenoco
ID: 22777274
Two thing i can think of...
1.. your server is infected with virus and it is using up all the bandwidth...  check the networking tab in the task manager and see if there is any traffic... (make sure no one is accessing the server when you do this)...

2.  an application is using up all the bandwidth... is it a web server, database, etc?

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by:Moron6969
ID: 22777631
It is a web server with SQL and sharepoint.
I checked the network usage and is not abnormal, also the task manage shows no strange processes or unusually high CPU usage.
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Expert Comment

by:takenoco
ID: 22777686

at this moment, when you don't see any adnormal behavior on the server, is the internet slow for other computers?
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Author Comment

by:Moron6969
ID: 22777832
I tested some things this morning before anyone was logged on. I pinged google.ca and response times between 1300 and 1900 ms, usually should be 2 or 3 ms. Did the same from a workstation and got the same results; as soon as I disabled the Server NIC, the same workstation got 2 and 3 ms response and had acceptable Internet speed.

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Assisted Solution

by:takenoco
takenoco earned 50 total points
ID: 22778037
I would like you to use packet sniffer to capture the packet and see if there is any adnormal behavior...
A free implementation of a packet sniffer is wireshark... See for deatils: http://wiki.wireshark.org/

Quickcheck... does your dsl activity light blink very fast when the server is connect to the internet?
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Author Comment

by:Moron6969
ID: 22778262
I'll try that later this aft, I'm not at that customers right now.
The activity light blinks regularly when the server is connected, once every second or so.
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Accepted Solution

by:
Moron6969 earned 0 total points
ID: 22787211
Figured it out; 3 evil words... Symantec Endpoint Protection!
Uninstalled the pig and all is well. This has been on the server since new (about a year) and decided to pull some updates that caused the problem. Put SAV 10.1 on and have no probs!

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Expert Comment

by:takenoco
ID: 22796090
Glad you found the problem....
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