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RJLemon
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Windows XP SP2 will not resolve DNS names in Web Browser (IE or FireFox)

When I type in a URL it always comes up with the message about unable to resolve the site name DNS is not working.

If I go to a DOS prompt and type nslookup then search for a site it resolves the name fine.

If I go to a DOS prompt and try and ping -a x.x.x.x it pings the site but does not return the name.

If I type the IP into the URL line it brings up the site just fine.

I have another computer on the same network both use DHCP and the other computer works fine.

I have tried this one computer on another network and I get the same results there.  I get the same results on a dial up connection as well.

Please help.  I am at a lose.  Unfortunately reinstall is a very, very last resort as is Windows repair.  This machine must remain attached to its domain so that it can access remote file and to be put back on the domain the computer has to travel a few thousand kilometers.


Thanks.
Windows Networking

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Keith Alabaster

8/22/2022 - Mon
mass2612

Hi,

Have you tried something like ipconfig /flushdns to clear the dns cache on that computer?
Jay_Jay70

can you post an ipconfig /all
Keith Alabaster

If you can resolve the name OK from a cmd prompt & nslookup on the client then DNS is fine.

Are you using a Proxy service? Check in the advanced settings of IE - tools - internet options - connections - LAN settings and tick/untick as necessary with the ip/port numbers.

Are you running the MS firewall? Is there an exception in place for IE?
Are you running anything such as Symantec, Zonealarm, Integrity or McAfee or any other third party firewall type product on the PC specifically designed to make your browsing experience a nightmare?


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RJLemon

ASKER
I am using a transparent proxy, which is working verified by numerous other computers.

I do not have any proxy settings on this machine and have actually set them and then removed them just to be sure.

MS Firewall is off.

Symantec Corporate used to be there but I took it off.

I will post ipconfig listing a little later when  I get the machine out.  It takes a while to boot.

Thanks.
Keith Alabaster

As mentioned, the DNS is operational else you would not be able to resolve from nslookup. You stated the box was on dhcp I believe.
How are you calling the transparent Proxy? Is this a plugin or on the box that is your default gateway? Can you remove, reboot and re-add the proxy?
RJLemon

ASKER
Correct DNS lookup via nslookup works.  Yes it is DHCP as are the other machines.  The transparent proxy is a smoothwall firewall/gateway.  I have tried with it disabled as well to no avail.

I did add manual entries for the proxy and duplicated this on another machine when the transparent proxy was off.  The other machine did work (I have an add stopper on it so I can see the messages that the proxy is sticking in for blocked adds).

See why this one got the full 500 points.  I have already spent hours on this guy.  Now it is a must solve cause there is no way a computer is smart then all of us.  Is there?
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Keith Alabaster

Nope; we can pull the plug out of the back.... :)

If you can see the output from the proxy, what is the exact message you are getting?
Is there an internal web site on the network; can you browse to that OK?
What device is between the clients and the internet?
If you've spent this long, is it cheaper for you to rebuild his machine (time-wise)?
SOLUTION
johnb6767

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RJLemon

ASKER
Howdy Johnb6767:

This I have not tried but definately will.

Thanks.
RJLemon

ASKER
Howdy All:

OK I have tried everything listed above and I do have a slight change.  Now as long as I specify a proxy server (not that one is available everywhere) it works.

If there is no proxy server available at the site the web broswer (IE 7 now, or FireFox) will not work.

FireFox gives a Server Not found page.
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Keith Alabaster

OK, I do not know whose thread you are following so as to avoid confusion I'll keep out for now. If you need my help later then just shout.
RJLemon

ASKER
Hi Keith

I have tried all above suggestions from everyone.

For yours

If you can see the output from the proxy, what is the exact message you are getting?

FireFox replies Server not found can't find server at www....... (direct connect to internet)
With a proxy server specified it works.  No other machine in the building specifies the proxy as it is a transparent proxy.

Is there an internal web site on the network; can you browse to that OK?
Yes and no.  It returns Unable to determine IP address from host name for ....
Yet other computers can use the same URL successfully.

What device is between the clients and the internet?
A smoothwall firewall.

If you've spent this long, is it cheaper for you to rebuild his machine (time-wise)?
It would be except I need access to the domain to reinstall some of the stuff and it is 3000KM away.  But that maybe the only option.
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camacho_marco

run msconfig and repair your computer, What are you using for Firewall??? Disable all firewall seting's including the AV. and try it again.

Cheers
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camacho_marco

Reparir your TCP IP protocol:
Go to your NIC properties
Select Install
Select ProtocolSelect Have Disk
Browse
C:\WINDOWS\inf
It will automaticalii select the name of the file and clico open, OK
Select Internet Protocol TCP/IP
And you have repair your TCP/IP Protocol

Cheers

johnb6767

Id have to say that keith_alabaster was on teh closest track with the proxy...

$.02
camacho_marco

Split the point Amigo lol

Cheers
Your help has saved me hundreds of hours of internet surfing.
fblack61
Keith Alabaster

:)