Sorry if this is the worng place, but i cant find an answer anywhere. regarding 2DF

I have had 2DF for a while now and today it would not let me play my friend. We would send requests and accept them, then we were stuck at the white screen with it saying “waiting for player 2”. We can both play other ppl fine and one other person had the same problem with connecting to me. Any ideas on what may be wrong?