co-op

When I try to load my single player farm to use as a co-op for my friend to join as soon as my friend joins it kicks both of us from the game and says connection lost to both of us. I have 3 cabins available on my farm but don’t know what the issue is.

My wife and I have been playing co-op for the last few days, and we're getting nonstop disconnections-every few days, both of us will lose connection when we go to bed, and frequently she'll get booted out of the game, it seems like every other day she'll get disconnected randomly. Both of us...

So currently I am hosting the server and I play with one friend so there's one cabin and I have the big house. My question is can I move the save file, so that my friend can host it and I could join the server as usual?