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Dated: Sep. 20, 2013

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Networking In General

1. VPN Error 800

"Unable to establish connection" - VPN client can not reach the server. This can happen if the VPN server is not connected to the network, the network is temporarily the network is overloaded with traffic. Finally, the local router can be incompatible with the type of VPN and maz require updating the router.

2. VPN Error 619

"The connection to the remote computer could not be established". This is a wall - port configuration issue and it prevents the VPN client in establishing a connection even if the server can be reached.

3. VPN Error 51

"Communication with the VPN subsystem" - Cisco VPN client reports this error when local services do not work or the client is not connected to the network. Restart the VPN service and/or troubleshooting of a local area network connection often solves this problem.

4. VPN Error 412

"The remote peer is no longer responding" - Cisco VPN client reports this error when the active VPN connection drops due to network failure or when a firewall obstructs access to the required ports.common vpn errors

5. VPN Error 721

"The remote computer did not respond" - Microsoft reports this error when failing to connect, like 412 errors reported by Cisco customers.

6. VPN Error 720

"No PPP control protocols configured" - VPN On Windows, this error occurs when the client has insufficient protocols for communicating with the server. Troubleshooting this problem requires the identification of the VPN protocols which the server can support and install the appropriate one on the client via the Windows Control Panel.

7. VPN Error 691

"Access denied because username and/or password is invalid on the domain" - A user may have entered the wrong username or password when they tried to validate the Windows VPN. For computers of the Windows domain, the domain must be correctly specified.

8. VPN error 812, 732 and 734

"The connection was prevented because of the policy configured on the RAS/VPN server" - On a Windows VPN, the user who is trying to verify the connection may not have enough access rights. A network administrator has to solve this problem by updating permissions for that user. In some cases, the administrator may need to update MS - CHAP (authentication protocol) support on the VPN server. All three of these error codes can be applied depending on the network infrastructure involved.

9. VPN Error 806

"The connection between your computer and the VPN server has been established, but the VPN connection can not be completed." - This error indicates that a router firewall prevents certain protocol traffic between VPN client and server. Most often, it is the TCP port 1723 that is in question.


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