Meteor deploy error and "site is down" html returned as logfile

Having some serious issues with meteor. This is for which has been running fine with no changes for a few months now.

Site is still up, but the database seems locked and I can’t publish a new version of it, get error message:
Error deploying application: Connection error (connect ECONNREFUSED)

If I try to get log files I seemingly get the html for “Site is down” returned instead of any logs.

Please advice.