I couldnt find a solution at the forum so I finaly open my own thread.
I tried to set a server up and connect from a client to it. I got the commercial licence so I thought it wouldnt be a problem but each time I try I get the unsupported feature error. Even after compiling.
After some tests I think the session_open/session_connect is not supported, I just dont get it how make my programm work through the internet if this isnt supported.

A6/7/8 ?

Do you have A8 or A7?
in A7, session_connect is not supported in commercial edition.
in A8, it is. Are you sure you have the key-file(licence) included like you were told in the email which came with the file?

thank you.
I got A7 could you give me a hind how it works there or where I can read about it?

edit

I have read the workshop but dont get it how to set a session or an ip
just that -ip through command line, I just would prefer some real code, thx for help anyway

you use "-cl" command line to start a client. -ip only gives an ip to that client, it won'T make the engine start as client.

"-sv" starts a dedicated server.

you can combine both "-sv -cl" to create a server that is also a client on his own system.
be aware however that usually its easier to have a dedicated server, because you only need one client code, as for "-sv -cl" you often need to adjust the client code just for this one client.

EDIT: Btw if you want a to connect in code, check out the multiplayer plugins.

"ANet" isn't free, but it has most features and is well tested.
"GstNet" is free, but is used a little less often.

Both are (in my eyes) a lot better than the build in multiplayer.

thank you, I already used the cmd line commands just didnt see the -ip.
so I'll try GstNet, need to stay on freeware.

ok, thank you again for your advise I think it's enought to complet my programm by now.