Hello everyone,

I don't know where else to turn to so hopefully someone here can help. We have a VPN with computers successfully connecting to it however, my Surface Pro will not connect. I have also tried a Surface Pro 3 and am getting the same issue which is leading me to think it is a Surface issue. We are using a L2TP/IPsec connection. I type in the IP address, user name & ID and get the Error 800 every time. The Surface Pro is using Win8.1.

Tried connecting with default VPN settings - error 800.

Tried connecting with firewall turned off - error 800.

Tried going into Network Adaptors and adding in the Share Key - error 800.

Tried from the Microsoft store on a store model Pro 3 - error 800.

Tried updating the Registry with the AssumeUDPEncapsulationContextOnSendRule  (support article 926179) - error 800.<o:p></o:p>

Tried from a non-Surface - connected just fine.

Any thoughts on what else to try? Ports 500/4500/1701 are open (other wise other PCs wouldn't connect), all PCs are up-to-date with patches.

Thank you for your help.

Shiva

Hi,

According to the description of the link below:

http://blogs.technet.com/b/rrasblog/archive/2009/08/12/troubleshooting-common-vpn-related-errors.aspx

This problem is most likely caused by necessary Port blocked by firewall.

Firstly, please follow the steps of the link above to make troubleshooting with your problem.

On the other hand, using telnet command to check if these port is blocked.

Such as: 1723, 47, 1701

Telnet command example:

telnet [VPN server address] [port]

You can refer to the content of the link below to learn more details about Telnet:

https://technet.microsoft.com/en-us/library/cc771275%28v=ws.10%29.aspx?f=255&MSPPError=-2147217396

https://technet.microsoft.com/en-us/library/bb491013.aspx?f=255&MSPPError=-2147217396