Yesterday, all of a sudden I can't login to my Thunderbird account at sannies@mailfence.com. Error message shows, "Login to server imap.mailfence.com with username sannies failed." I tried again and got the following error message, "Cannot connect to the server. You may have exceeded the number of connections to the server" I'm not sure I understand that. I have one email account for Mailfence. However, there may be an old profile somewhere on my computer that hasn't been used since I move a year ago. What does "number of connections" to the server mean if it doesn't mean when I'm connected to the server? Nothing has changed about my username and password. I tried the suggestions on the Help site. They did not work. My security shows that Thunderbird is not blocked. Windows Firewall shows that it is not blocked. OP is Windows 10 (updated Jan 2023. Security suite is Avast One (updated Jan 2023). Server is Mailfence. I use the latest version of Thunderbird. BTW - Your "Email me when someone answers the thread" does not work when I check it.