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Troubleshoot VPN connections and error codes

Issues or Symptoms Article Title & Link

Description or Resolution

 

Error 1053: The service did not respond to the start or control request in a timely fashion.

Routing and Remote Access stops responding in Windows Server 2003 A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that is described in this article.  
       
Error 633 - the modem (or other connecting device) is already in use or is not configured properly. "Error 633 - the modem is already in use" error message when you try to establish a VPN connection... This issue may occur if the TCP port that is used by the VPN connection is already being used by another program. The VPN connection uses TCP port 1723 to establish a connection. If another program is already using this port, you cannot establish a VPN connection.  
Error 792 and Event ID 547 - IKE security association negotiation failed. You receive an "Error 792" error message and you cannot connect to a node in a Windows Server 2003... To resolve this problem, obtain the latest service pack for Microsoft Windows XP. A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that is described in this article.  
When you try to establish a VPN connection, you may receive the following error message: Error 800 Error Message: VPN Connection Error 800: Unable to Establish Connection This issue may be caused by a router that has outdated firmware. For example, this issue may occur if you are using a Cisco router with firmware that is dated 2000 or earlier.  
You may want to place a PPTP server on the internal network and configure Windows XP ICS to forward the VPN traffic to the PPTP server.

How to Configure Windows XP ICS for an Internal PPTP Server

 

This article describes the process that is required to map PPTP back to an internal host, so that an incoming VPN connection can pass through the Windows XP ICS computer. For the purposes of this article, it is assumed that the PPTP server is already configured properly and is able to accept PPTP connections from clients on the local network.  
This article lists the error codes that you may receive when you use Windows 2000, Windows XP, or Windows Server 2003 as a client computer to make a dial-up connection or a VPN connection List of Error Codes for Dial-up Connections or VPN Connections Note Error codes with numbers higher than 900 will only be seen if you are trying to connect to a Routing and Remote Access Server that is running Windows 2000 or later.  

Troubleshooting VPN connection issues typically involves contacting your Internet service provider (ISP), your VPN server administrator, or your router or firewall manufacturer.

When you try to connect to your VPN server, you may not be able to connect, and you may receive one of the following error messages:

Error 678: There was no answer.

Error 930: The authentication server did not respond to authentication requests in a timely fashion.

Error 800: Unable to establish connection.

Error 623: The system could not find the phone book entry for this connection.

Error 720: No PPP control protocols configured.

To resolve this issue, use one of the following methods:

Verify that you have connected to the Internet before you try to connect to the VPN server.

For additional information about troubleshooting Internet Connectivity in Windows XP, click the following article numbers to view the articles in the Microsoft Knowledge Base:

314067 How to troubleshoot TCP/IP connectivity with Windows XP

314095 How to troubleshoot possible causes of Internet connection problems

If you can connect to the Internet but you still cannot establish a connection to the VPN server, and you receive error 623, see the following Microsoft Knowledge Base article:

227391 Error message: "Error 623 the system could not find the phone book entry for this connection" when making a VPN connection

If you can connect to the Internet but you still cannot establish a connection to the VPN server, and you receive error 720, see the following Microsoft Knowledge Base article:

314869 Error 720: No PPP control protocols configured

If you still cannot connect to the VPN server, the VPN server may not be configured correctly. Contact your VPN server administrator.

If you are the VPN server administrator, see the following Microsoft Knowledge Base articles for additional information about how to configure a Microsoft VPN server:

308208 How To Install and configure a virtual private network server in Windows 2000

162847 Troubleshooting PPTP connectivity issues in Windows NT 4.0

299684 Error message: Error 930; The authentication server did not respond to authentication requests in a timely fashion

If you use a personal firewall or a broadband router, or if there are routers or firewalls between the VPN client and the VPN server, the following ports and protocol must be enabled for PPTP on all firewalls and routers that are between the VPN client and the VPN server:

Client ports

Server port

Protocol

1024-65535/TCP

1723/TCP

PPTP


Additionally, you must enable IP PROTOCOL 47 (GRE).

Note If you cannot connect to shared resources on the remote network by computer, you can use the remote computer's IP address to connect by using UNC (\\<IP_Address>\Share_name). Edit the hosts file in the Windows\System32\Drivers\ folder, and add an entry to map the remote server's name to its IP address. Then use the computer name in a UNC connection (\\Server_name\Share_name).

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