VPN Error 800 Explained
Sunday May 28, 2006
One of the most common errors encountered when working with a VPN is error 800 - "Unable to establish the VPN connection." Unfortunately this error code doesn't tell you anything of why the connection is actually failing. If you encounter it, check the following:
- Are you using the correct VPN server name? The server administrator provides this name.
- Is the Internet / network connection to the server functioning properly? You should ping the server is not sure.
- Is your network firewall blocking VPN connections? Port 1723 must be opened and Protocol 47 must be enabled in the firewall configuration settings
- Does the server have too many clients already connected (VPN server connection limit exceeded)? The server administrator can check this, but it is not a common problem.
I just discovered that this error can also be caused by a corrupt LSP stack.
Also a possibility is to disable Norton Antivirus Internet protection (it probably contains a firewall)
Regarding Norton, the Norton firewall causes endless problems sometimes. I would recommend anything BUT Norton. Heck, even the built in XP Firewall is better than Norton.
This is VERY important. You may get this error if the subnet is the same on both ends.
I.E 192.168.1.xxx on the remote network you are trying to connect to via VPN and 192.168.1.xxx on the local network you are connecting from.
For this reason it is a good idea NOT to use 192.168.1.xxx on your business network which you will be VPNing to, especially if you use SBS 2003 as a VPN server.
I have to give credit to this post:
http://techrepublic.com.com/5208-11190-0.html?forumID=40&threadID=177525&messageID=2235503
Tks!
My problem is the AV System (Trend Micro).
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In my case, if I reboot the PC, the connection is fine. But from time to time, it will suddenly stop working. I hope someone can tell me a solution without rebooting.