Error 800: unable to establish a VPN connection


I am having problems connecting to the office network.  I have a windows XP Home Edition laptop with SP2.
The VPN connection was working fine 3 days ago and previously but not now. When I try to connect to the network I get the message: "Error 800: Unable to establish VPN connection. The VPN server maybe unreachable."
- I have tried recreating the VPN but to no avail.
- I am using a wireless network to connect to the internet.
- I have just tried the VPN connection on another laptop and it works fine with the same wireless network.
- Windows firewall is turned off.
- At home on my desktop PC i can connect to the wireless network.

Any ideas? Any settings to check?

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FPPADMINAuthor Commented:
- I have tried another laptop and I can connect to the VPN. My desktop PC at home can connect to the VPN.
- I am creating the VPN through Network connections > Connect to the network at my workplace > etc etc................
- The VPN connection has already worked for this user on their laptop but all of a sudden i get the error 800 message.
- User has Windows Defender and AVG anti-virus software on his laptop..However so do all other laptops and PC's and it has not made a difference there....

Any ideas?
FPPADMINAuthor Commented:
I tried "telnet" 1723 from command prompt and i got this message:

"Connecting to not open connection to the host, on port 1723: Connect Failed"

What do i do? how do i open this port?


Assuming all other computers can establish the VPN except this laptop, I would double-check the laptop security settings. These cases may help,

The client could not connect to the remote computer
The user uses Norton security and open the port 3389. The LAN users can access Remote Desktop computer but not not VPN clients. After checking the Norton ...
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ras error code
The VPN server may be un-reachable, or security parameters may not be configured ... for example, if you use Norton secure software, you may need to add the ... 

FPPADMINAuthor Commented:

- There is no Norton security software on the laptop.
- The firewall is turned off.
- The laptop is an Acer aspire 5670.

I am clueless... what should i do?
Rob WilliamsCommented:
>>"Connecting to not open connection to the host, on port 1723: Connect Failed"
This works from other sites, and your VPN works from other systems, so the problem is obviously the laptop from which you are trying to connect. There can be numerous reasons why the VPN will not connect but since telnet is not working either, it is pretty well guaranteed the service/port is being blocked by a firewall application of some sort. Are you certain the Windows firewall is disabled? Check under the services management console to verify the "Windows Firewall/Internet connection Sharing" service is disabled, and also look for other firewall apps either independent or ones part of a security suite. Ones to look for are ZoneAlarm, McAfee, TrendMicro and Symantec security suites, "Internet Worm Protection" included with virus programs such as Symantec, even try disabling AVG and Defender.

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