VPN的问题，以启用CI系统和访问MAC以进行Visual Studio开发

Question

I am trying to setup build servers, and a mac available for remote builds in VS. As results I have a Synology server setup with VPN enabled. The Firewall and all settings are setup according to the synology guide . I have then enabled port forwarding on my linksys WRT1900ACS router, for the three ports needed (500,1701,4500), which is also enabled in the firewall on the router. I then access the VPN locally without any issues, tried with different guides ( guide1 guide2 guide3 ).

I then create copies of the vpn connection and inserting my static IP from my ISP. I logon to a tethered internet from my phone, as to ensure the network is different. I then get an error:

local l2tp connection attempt failed because the security layer encountered a processing error during initial negotiations.

Searching it seems like it is an error with the registry ( reg 1 reg 2 ). Changing that just makes the vpn connection hang. What am I doing wrong? After waiting a long period of time (several minutes), the same error returns.

I have also tested on an Ipad using the settings defined in ios-settings .

Answer 1

For others the above guides solves the issue if you have a static IP. You however have to ensure that your ISP, have allowed the traffic, and that your router does not receive a double IP registration, rendering your static IP invalid.

which was the case for me.