Monday, March 11, 2013

Solution for VPN Error 800

Many people experience a network problem known as VPN Error 800. It is a connection establishment problem. It appears while establishing a Virtual Private Network (VPN). No enough information appears to diagnose your problem.

Error Message

Error 800: “Unable to establish the VPN connection.”

1. Ping the Server
2. Disable Firewall/ Unblock Port 1723
3. Verify the VPN Server Name
4. Make sure that the Server doesn’t have Multiple Clients
5. Repair Registry Configurations
6. Reinstall the VPN Client
7. Uninstall Microsoft OneCare

Ping the Server

Use Command Prompt to run the PING command. This command will help you know whether the information can be sent/ received. Follow these guidelines:

1. Click Start, point to All Programs | Accessories.
2. Right click Command Prompt, select Run as Administrator.
3. Type following command-
ping <Server IP Address>

For example: The Server IP Address of is, so I would execute the following command-

4. Press ENTER.
5. Read the output statistics carefully. Consider the %Loss, Sent and Received Packets information. Contact your Internet Service Provider in case the %Loss is higher.

Disable Firewall/ Unblock Port 1723

VPN Error 800 appears if your firewall program blocks Port 1723. Disable the firewall software- either Windows Firewall or third party software- to fix the problem.

Disabling Windows Firewall:

1. Click Start | Control Panel.
2. Click System and Security | Windows Firewall.
3. Click Turn Windows Firewall On or Off link.
4. Turn off your firewall software and apply the changes.

Verify the VPN Server Name

Make sure whether the VPN Server Name entered is correct or not. Incorrect VPN server name can show VPN Error 800.

Make sure that the Server doesn’t have Multiple Clients

The server with whom you’re trying to establish connection could have multiple clients. This of course is not possible from your side. Contact the server administrator team to check this issue.

Repair Registry Configurations

Windows Registry is a complex database that contains PC settings. Some of the registry entries could be corrupt. This lead VPN Error 800.

1. Scan your registry using RegInOut Registry Cleaner.
2. Fix all the problems detected.

Reinstall the VPN Client

Enter the user name and password provided by your VPN Vendor during the setup. Reinstall the VPN Client at your end.

Uninstall Microsoft OneCare

Microsoft OneCare is a security software from Microsoft. Connection conflicts with this software shows VPN Error 800. Uninstall the software to fix your problem.

1. Click Start | Control Panel.
2. Click Programs | Uninstall a Program.
3. Select Microsoft OneCare.
4. Click Uninstall.
5. Follow the wizard and restart your machine.

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