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Port 80 Blocked (Windows XP)


Issue: the network is connected, but the websites are timing out when trying to access them with any browser. (Updated)

Solution: The problem is usually firewall related. Things to do:


Disable windows firewall or any other third party firewalls installed. These can be AVG, Symantec, Macaffe, ZoneAlarm.

Browser Proxy

Check for proxy settings in your browsers. It may be setup to go through a proxy server that doesn't exist.

If you are using one particular browser, try a different one and see if it works:
- Firefox
- Chrome
- Safari

VPN Software

Check for any VPN software. The Cisco VPN client has a Zone Alarm firewall client and when uninstalled does not properly remove the firewall from the windows configuration, blocking port 80. To disable the firewall, do the following:

1 Restart Windows XP in Safe Mode.
2 Start->Run. Type in Regedit to open the registry editor.
3 Navigate to HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\vsdatant
4 Click start in the right pane and modify the value from 2 (may be other than 2) to 3.
5 Restart the PC

Spyware Removers

Finally, if none of those things work. Run spyware removers.

Comments (16)
cctv server port not open
16 Thursday, 29 March 2018 06:26
my dvr setup portforwarding,but network server port 8000 and 80 are to resolve the probluem
me helped
15 Saturday, 21 March 2015 15:37
I tried a lot of things and this helped me for example.
"You may want to try netsh winsock reset to reset the Winsock Catalog. This will remove some of the low-level antivirus filters."
Port 80 Blocked, Windows XP
14 Tuesday, 31 July 2012 19:30
Feelgoodnow !!!
Maaaaaaan... Do I love you !!!! This vsdatant key thing... you saved my life !!! Thanks ! Now I can die happy !!!

PS: I now for ever hate cisco ! ;-)
http url's blocked Phew found this
13 Thursday, 23 February 2012 06:46
GREAT job after couple of days trying all sorts of methods none worked.
Kept trying to solve found this posting and "It worked first time"
Many Thanks for your Posting ..
12 Monday, 01 August 2011 00:25
Thank you very much,
This tip helped lot......
Port 80 Blocked
11 Wednesday, 25 May 2011 10:40
I have exactly the same problem as Amanda, this seems to be one of the only threads that mentions the problem, wondering if anyone has any advice for this situation or if you resolved the issue?
Request Port 80
10 Friday, 22 April 2011 21:45
Request File
Port 80 Blocked
9 Monday, 07 February 2011 08:07
very good ans useful information
Many thnks
Port 80 blocked???, wxpsp3
8 Saturday, 08 January 2011 21:17
Anne Marie
Amanda, your post was so old i was not going to respond, but yet, i do.....same issue with my network...what was your solution....? Happy 2011 from Jersey
Port 80 Blocked, Windows XP
7 Friday, 15 October 2010 10:22
MANY THANKS for the following tip: there was realy a version of Zone Alarm firewall installed on the PC.

After a restart, the Internet connection (Port 80) was open for about 8 or 10 minutes. Then, the Port was blocked. All other Ports were open.

The only solution was your description:

3 [...] Navigate to HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\vsdatant
4 Click start in the right pane and modify the value from 2 (may be other than 2) to 3. [...]

Many Thanks!
Port 80 Blocked, WIndows XP
6 Wednesday, 30 June 2010 10:38
Go under your internet settings if you are using IE8 to tools then internet Options then to connections and check your LAN settings. Also make sure you have gone to your fire wall and enable HTTP, HTTPs and FTP if they aren't checked.
5 Friday, 26 March 2010 21:56
not able to connet to any web page
4 Monday, 15 March 2010 02:02
it tried every things like puting windows firewall off, DNS flush, TCP/IP reset but still the problem is same.
then i restore the system to prevoius restore point then its will working
Port 80 Blocked, Windows XP
3 Thursday, 19 November 2009 17:04
Hi - she has sent an update about this issue - there was a bunch of other stuff that was corrupted and missing on the system. She said that the reinstall was the simplest thing to do instead of trying to find out what else is not working.
Port 80 Blocked, Windows XP
2 Thursday, 19 November 2009 05:58
Hmm. silmilar issue here. DNS works fine, but all major IP stuff (FTP, HTTP, HTTPS seems blocked. I've just disabled the firewall by stopping and disabling the service and then rebooting, but still have the same problem.

I have recently uninstalled Norton internet security which might be causing the problem. I'll report back with any further findings. BTW did you ever get to the bottom of your problem?

Port 80 Blocked, Windows XP
1 Thursday, 27 August 2009 14:05
Hello, I really love the site and I reference it frequently when I am working on machines for different clients. However, I've got a machine that can't get to any http sites. I read your article on the subject of unblocking port 80 and it seems textbook--he once had the Cisco VPN client installed, he can access https but not http... However, when I enter the registry, there is no entry called vsdatant in the path you specified. This is XP Home, if that makes a difference for this. Any advice on getting this port opened?

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