Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Authentication failure while connecting to server

  • 1 reply
  • 3 have this problem
  • 9 views
  • Last reply by david

more options

bold textWhen I try to open Thunderbird I see a message saying " authentication failure while connecting to server "

'''bold text'''When I try to open Thunderbird I see a message saying " authentication failure while connecting to server "

All Replies (1)

more options

Sometimes trying different authentication settings resolves it. Posting your settings here may help, or contact your email provider to verify you have the right settings.