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Never seen anything like this strange browsing behavior after router replaced.

Posted on 2013-11-08
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Last Modified: 2013-12-12
Windows Server 2003 running DNS, network 75 users or so, XP and WIN7 replaced router and browsing now locks up using IE, Firefox, and Chrome. Replaced router again and verified it's not the point of failure (could be convinced if good enough case made).

Problem is intermittent enough that browsing works on some computers for awhile then freezes hourglass while waiting for content to upload.

Did the usual ipconfig /flushdns, renew /release, ran intodns.com, dcdiag /test:dns, put old router back in works fine. Problem is the old router is 100M new one is 1G needed for new network from new ISP.

When browsers lock up clicking stop then refresh site pops up immediately.  

DHCP running on the server (off on firewall), firewall has the latest firmware and has been replaced.
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Question by:WORKS2011
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by:Dave Baldwin
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I ran into a situation where really old network cards would not play well with Gigabit Network interfaces.  It wasn't even the direct connection but there were some software bits that weren't compatible between the two and this was thru a switch that was in between the two.
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by:Tech Savy
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Could you take a netmon/wireshark trace when the issue is happening and post it here?
That could tell me what exactly the problem is.
Take a working and non working trace on the client and server machine.

Also work on one specific client machine where you are facing this problem.
Update its NIC drivers and then see if you are getting the issue.

Also check if TCP offloading features are disabled on the new NIC interface

Do you have NIC teaming enabled by any chance on the server ?
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by:WORKS2011
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@rauldeshmukh
Could you take a netmon/wireshark trace when the issue is happening and post it here? That could tell me what exactly the problem is. Take a working and non working trace on the client and server machine.
not sure what wireshark will show when their is a disconnect. I don't mind installing and trying this but I've used it before and not seeing where it will help.

You both mentioned NIC's, I've had the problem on XP and new 3 month old WIN7 machines. For the amount of users to be affected 75+ I find it hard from a troubleshooting standpoint several NICS would be the problem especially since new NIC's are affected.

Your thoughts?
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by:Tech Savy
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As part of the question you mentioned it freezes up, you didn't mention it disconnects.
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by:footech
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You might try a tracert or utility like PingPlotter to see if you are experiencing packet loss.  Any chance on the old router you had one of the interfaces fixed to a certain rate?  If both sides of a connection aren't set to fixed, or both dynamic, it can cause some problems.
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by:Craig Beck
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What's the new router?

Have you tried configuring the interface on the router at 100M/Full-Duplex?

Was it being used as a DNS forwarder?

What forwarders is your DNS server using?

What DNS servers are the clients using?

Have you tried pinging URLs to see if they resolve every time?

Have you checked that your new line isn't disconnecting?
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by:WORKS2011
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What's the new router?
NetGear ProSafe

Have you tried configuring the interface on the router at 100M/Full-Duplex?
It's on auto now not sure 100M/Full will suffice since going to a 1G network.

Was it being used as a DNS forwarder?
2003 server forwards to DNS in router which is configured with ISP DNS.

What forwarders is your DNS server using?
forwards to router

What DNS servers are the clients using?
LAN DNS server

Have you tried pinging URLs to see if they resolve every time?
yes, it doesn't seem to be a connection or DNS and it so random difficult to troubleshoot. One thing that's common is after a site freezes stopping and hitting refresh it always pops up instantly.

Have you checked that your new line isn't disconnecting?
yes line is fine.
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by:WORKS2011
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I'm now testing setting to 1000BaseT Full_Duplex will let you know.
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by:Craig Beck
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Ok, so first - is your new internet circuit really a 1G circuit, or is it just a 100M on a 1G bearer?  I don't think I know of a single ISP that offers 1G services that would supply or suggest a Netgear Prosafe router?!

Second, why not just forward straight to the ISP DNS from the 2003 box?  I'd never use a router as a DNS proxy unless I absolutely had to.
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by:WORKS2011
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I'm testing the actual speeds now but the problem has always been since installing the router and it acted the same way on the old network before switching to the faster newer network.

I configured the forwarding to go straight through to the ISP and it didn't like it, got worse. Also tried Google DNS and same thing. Didn't like it.

Since it's a point of failure thinking the router should be switched out with another different brand but it doesn't make sense everything is setup correctly and nothing crazy going on with the router config.
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WORKS2011 earned 0 total points
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turns out nearly all the DNS root hints would not resolve to anything, I deleted and reset DNS when it started working better as DNS began to work better. Three to four days later it worked without any error. Thanks for all the help.
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by:WORKS2011
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found the problem myself, thanks for all the help
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