Ken, Both of my production servers see the exact same problem. What was worse I was seeing around 100K failed attempts to login to my root user. A bit of research and now my firewall ignores any attempt from PRC.
Sort of a cost of doing business Steve Hanselman Sent from my iPad > On Jan 7, 2022, at 20:24, Ken Wright <[email protected]> wrote: > > My Dovecot issues continue. Right now I see at least two issues: > first, my logs consistently show non-users trying (and failing) to log > in, and I'm still unable to log in from my email client (Evolution or > Roundcube, either one). > > I'll post about the second issue later; right now I wonder why I'm > getting so many non-users trying to log in. Am I the subject of > concerted hacking attacks, or is there something else going on? Some > of the attempted logins are more-or-less random names claiming to be > @mydomain, but at least one is a username that's really on my server, > to wit: > > Jan 7 22:52:01 grace dovecot: lmtp(776281): Error: lmtp-server: conn > unix:pid=776262,uid=117 [3]: rcpt [email protected]: Failed to > lookup user [email protected]: Internal error occurred. Refer to > server log for more information. > > (Another quick question: which server log should I check?) > > So, if anyone can tell me what's going on with all these logins, I'd be > much obliged! > > > Ken >
