Why can't I reach URL by name, but IP addr works?

[joeu2004]

Using IE, I can go to a URL using its IP address, but
not when using its name. nslookup of the name works.
However, I cannot ping or tracert the name, although
I can ping and tracert the IP address.

Why would nslookup work, but domain name resolution
fail when done by "applications" (IE and commands)?

If I disable the Symantec firewall, IE can go to URL
names. So I suspect that my firewall rules are too
strict. But I do not see an obvious problem.

What might I have blocked that could adversely impacts
domain name resolution by applications?

Sorry, I am away from my PC at the moment, so I
cannot provide a list of the current firewall rules.

But any insight would be appreciated.

 

[Chuck]

Using IE, I can go to a URL using its IP address, but
not when using its name. nslookup of the name works.
However, I cannot ping or tracert the name, although
I can ping and tracert the IP address.

Why would nslookup work, but domain name resolution
fail when done by "applications" (IE and commands)?

If I disable the Symantec firewall, IE can go to URL
names. So I suspect that my firewall rules are too
strict. But I do not see an obvious problem.

What might I have blocked that could adversely impacts
domain name resolution by applications?

Sorry, I am away from my PC at the moment, so I
cannot provide a list of the current firewall rules.

But any insight would be appreciated.

Joe,

DNS resolution is affected by the LSP / Winsock subsystem.
http://support.microsoft.com/?id=318584
http://support.microsoft.com/?id=811259

If XP RTM or Service Pack 1:
1. Backup and delete the following registry keys:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Winsock
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Winsock2
2. Reboot.
3. Open the network connections folder, right click your network connection, and
click Properties.
4. Click Install | Protocol | Add.
5. Click "Have Disk...", type "\windows\inf" in the box, and click OK.
6. Click "Internet Protocol (TCP/IP)", then click OK.
7. Reboot.

If XP SP2:
1. Start - Run - "cmd".
2. Type "netsh winsock reset catalog" into the command window.

Give LSP-Fix <http://www.cexx.org/lspfix.htm>, WinsockFix
<http://www.tacktech.com/display.cfm?ttid=257>, or WinsockXPFix
<http://www.spychecker.com/program/winsockxpfix.html> a shot.

If no help yet, reset TCP/IP.
http://support.microsoft.com/?id=299357

Start - Run - "cmd". Type "netsh int ip reset c:\netsh.txt" into the command
window.

--
Cheers,
Chuck
Paranoia comes from experience - and is not necessarily a bad thing.
My email is AT DOT
actual address pchuck sonic net.