It may be certificate errors. My self-signed certificate for sobac.com expired some time ago, and the Prosody cert generator replaced it with one for cn=prosody.com which is completely invalid. On top of that it has also expired, so it's a doubly invalid certificate. I will fix it eventually, but I want to get a cert that lets me issue certs for my own domains, and preferably ones that are recognized by browsers and OSes. Right now there seems to be no adequate solution that doesn't involve the commercial CAs and beaucoup de $$$