Well yea, that works… but then I get the bad gateway. If these are the problems to begin with, how and why should I even try to coinjoin via this thing?
Discussion
It has always worked for me, I have never had any issues apart from the login. I have just started it now and I can connect. Try reinstalling it.
JAM makes JoinMarket really easy, it is worth spending time on it.
Apparently it has something to do with the version of bitcoin core. It gives problems with 26.0