I get this error message with every version of newsbin BUT 6.50.
[15:05:40] ERROR DG - Connection Failed: Newshosting Server Index:1 502 Authentication Failed
The weird thing is that after a few seconds it connects just fine, and eventually all the connections work--but sometimes it can take a few minutes for all the connections to work. I never get this message with the 6.50 version of Newsbin. I guess I could just use that version, but I would like to take advantage of the features in newer versions.
I use Newshosting usenet server. I don't think they use TLS, but I am not sure. I have SSL enabled--but the problem persists even without SSL enabled. I am not using too many connections. I also use Newshosting's official client and haven't ever gotten this error--but I prefer to use Newsbin because it has more features.