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Internet or DNS issue

Posted on 2013-01-16
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Last Modified: 2013-01-21
I have a strange problem.

Network:
2008 R2 domain and windows 7 clients. Simple network. Switch connected to Firewall connected to ADSL router.

Problem:
Clients can ping websites but not display in browsers.

What I've tried:
Checked firewall has outbound rule for HTTP, DNS, HTTPS,
NSLOOKUP returning correct info, pings alive from firewall and clients.  
enabled DNS logging and no errors.
Flushed DNS on clients. Tried setting DNS to googles to bypass internal but no change.

...next thing to try is connect laptop onto ADSL router, configure NIC as secondary WAN IP and check connecting directly to the internet from there.

Any other suggestions to try? very weird!
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Question by:BerryGardens
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by:kadafitcd
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Have you tried turning off the Internet Security/Antivirus application on any of the computers?  It could be the culprit if it is we can troubleshoot.  Just try and disable the AV and then try to browse and let us know the result.
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by:rharland2009
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It sounds as if you have some weird proxy or other info configured in your browsers.

1. Do you have the same result regardless of browser - IE, FF, Chrome, Safari, etc.?
2. I agree with your next step. It will tell if your problem exists because of the firewall, at least.
3. Make sure you have an inbound rule for http/s/dns as well.
4. From your 2008R2 box, can you directly query external DNS servers via nslookup? If so, then at least you know DNS is getting in and out of the network.
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by:hau_it
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I had a similar problem last week in my home. I was able to translate web sites (although i could not ping) and my Router was sync. with DSLAM.
I called the ISP and they reset my line. After that everything was ok
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by:BerryGardens
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Turned AV off and no change.

1. Regardless of any browser the same issue.
2. Will try and see....
3. Inbound rule for http, https and DNS? I'm not hosting any web servers on port 80 or 443. I have the same setup at site 2 with deny all inbound and no issues there.
4. Yes I can query other root servers for nslookup. I've tried all the usuals 2.2.2.2 and 8.8.8.8 then a couple of root servers.

Thanks for looking... I'll update shortly but if you have any other ideas. Sometimes workign solo you can miss something.
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by:BerryGardens
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I will mention BT engineer was just on site installing fibre and problems are appearing since. Hmmm like your thinking hau_it
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by:rharland2009
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I meant just to verify that the incoming http/s traffic is allowed back onto your LAN.
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by:BerryGardens
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Good point yes it is.
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by:tmoore1962
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Sounds like a config issue on your firewall,  Ip address gateway issue.  Verify that the firewall's public IP info is correct.
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BerryGardens earned 0 total points
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Reset firewall to factory settings and reconfigured basically (similar to most home adsl networks) but no change. Put in a similar model with same basic setup  and worked. Thanks for all the suggestions but hardware fail grrrr!
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by:BerryGardens
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Sadly no points.
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