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Network Connections Blocked, how to unlock?

There is a computer on our domain that is blocked from intranet and internet. The firewall isn't blocking it as it can't get that far. I think an old IT company blocked the network connection locally on that computer instead of connecting it to the network and blocking on the firewall. I looked in the run>MMC but there are no policies there to block. The network connections are enabled. I installed a USB wireless device and it sees our wireless but when it connects it has limited connectivity and doesn't even see the intranet, hence why I am thinking the old IT company blocked all network connects.

What should I look to undo?
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Chetan Khurana
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If you run an ipconfig, is the PC getting an IP? If you are just checking through a browser, check to make sure proxy settings aren't enabled if you don't use such.
This link should also help, especially if you are having SP2 - http://www.pchell.com/support/limitedconnectivity.shtml
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First part didn't work and the diagnostic said everything passed.
When you say the first part didn't work, are you saying the PC isn't getting an IP?
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No proxy is setup, the diagnostic said that. If I do an ipconfig, it get some random 192.168.x.x and not our network IP. It claims its on the same subnet but sees no default gateway or DNS, this tells me the computers interface cards are being blocked.

When I said the first part didn't work, I mean disabling the limited connectivity check box does nothing. That link really didn't have much to say.

I will look at the SP2 link, not sure what SP it has.
SP is service pack 2.
Refer below to check what version of XP you are using -

1. Click Start, and then click Run.
2. In the Open box, type winver.exe, and then click OK. The version number is displayed in the About Windows box.
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I know what SP is....I was saying I don't know what SP it has so I am going to check.

Please do NOT focus on the limited connectivity comment, that message comes from a wireless USB I put it to troubleshoot. There is a policy or something that blocks all network connections from connecting to anything...
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FYI - it has SP3 installed.
Sorry, my Bad.

Just to re-iterate, have you checked the LOCAL XP firewall (if not please disable it and re-check net access)?

For registry settings which could be blocking network, check if anything in here could be the culprit - http://www.pctools.com/guides/registry/detail/1047/

Also, do you have any other users created  on this m/c which could be used to check user level n/w block?
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No biggie.

Yes, I've disabled the windows firewall and nothing has changed.

I'll check the registry. This computer isn't connected on the domain so the account we are using is its local administrator account, not sure what you were asking, did that answer that?
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What are the sockets and what do they do?
Essentially, the sockets control how Windows connects to networks. Corrupted WinSock can cause the symptoms you are experiencing. For details see: http://en.wikipedia.org/wiki/Winsock
Have you tried utilizing LSPFix or otherwise reloading the TCP/IP protocol stack?
Resetting WinSock will also clear LSPs.
Reset the TCP stack, first (i.e. before Winsock... Winsock hardly ever gets corrupted, in my experience).

Open a command window and run
netsh int ip reset c:\reset0403log.txt
WinSockFix also resets the TCP/IP stack. It saves steps and ensures that everything is reset to defaults. It works in some cases when the netsh commands do not.
> It works in some cases when the netsh commands do not.

I don't see how that's possible, since winsockfix actually uses netsh to do its resets.
I know it does, but there must be something additional. I've seen it work when netsh did not, plus it's easier.
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Chetan Khurana
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Also, have you checked for any spyware/virus etc? maybe something else is the issue.

Check this Link for ensuring any existing ipSec policies - http://support.microsoft.com/kb/813878
Just a quick question that no seems to have asked has the IP been given via DHCP or is it static?

Have you tried changing the IP address to match your network and manualy entering DNS and Default gw?

Also running a packet capture on the interface do you see any traffic? broadcasts or anything.
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I deleted that account and started using the other account with no problems. I assume I'd be able to create that account again with no problems if we had to use that name.