How do I make the game connect to my server

I try to connect to server by using "Multiplayer", but the connecting is failed except for connecting to "wss://multiplayer.scirra.com".

How can I do to make the game connect to my server?

Currently you can only use the official scirra server that you listed above, it does however automatically connect you to a lan game if it detects it, but lan games need the internet to make the initial connection.

Edit: it helps to point out that the signalling server only helps people connect to the game, once connected the server isnt involved at all

So can I create a game server by using C2 ?

From my understanding, Multiplayer is based around P2P, so its serverless

Yes, just like somebody enter a room as a host, than other can join.

But that's not what I want.

I just wonder can C2 create a game server?