I am trying to set up a S2S VPN with 2 Windows 2019 servers. Lets say we have a Site A and a Site B.

So I've setup two Windows 2019 server with Routing and Remote Access enabled. On both sites I added a Demand-dial interface. Site B is running well. It connects via the Demand-dial interface to Site A. Site A is not able to connect. The error message is "The interface is already connected".

When I disconnect the Demand-dial interface on Site B. Site A is able to connect. After that Site B is able to connect too.

So it is only running, when Site A is connecting before Site B. The other way round is not working.

  • Why are you trying to connect from both sides? Only one connection is necessary. Oct 7 '21 at 7:44
  • All documentations require two connections. Like you can see here: youtube.com/watch?v=eJH56qMNRu8. With only one it is not working.
    – Chris
    Oct 7 '21 at 8:23
  • Well, then my S2S has been working on magic for the last years. Oct 7 '21 at 8:37

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