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4/20/19
Getting authentication failure when using Mozilla Thunderbird. 1 Recommended Answer 235 Replies 357 Upvotes
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Last edited 5/31/19
Since a power failure on Monday, I am not able to send or receive email using Mozilla Thunderbird to download from a gmail account. I was asked to validate credentials when I first tried - I entered the correct password for the gmail account but login failed. I now get "Authentication failure while connecting to server imap.gmail.com" whenever I try to do something. I have two other email accounts which are still functioning in Thunderbird - one is a gmail.  I know that the password I am using is correct as I can log directly into the gmail account to see my messages.  I changed the Server setting to "Normal Password" (from OAuth2) to try to reenter the password but the login still fails.  If I need to remove and re-add the problem email account, how do I do that and will I lose all the emails that are sitting in Thunderbird right now?

I am using a Microsoft Surface Pro 4 and Mozilla Thunderbird.   The server is set to imap.gmail.com on port 993.

Thank you for any help - I am stumped!
Dee
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4/20/19
What's the exact and complete message you receive beyond "Authentication failure while connecting to server imap.gmail.com"? Does it include anything else or refer you to a linked article for troubleshooting?
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4/20/19
That is the entire error message "Authentication failure while connecting to server imap.gmail.com." - It appears in the lower right corner of the page with only an 'x' to close the message.  Clicking on the message does nothing.  The message appears if I try to get emails or send and remains on the screen for perhaps 10 seconds.
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4/21/19
A good way to begin will be to look at the Troubleshooting Information. With Thunderbird open, click on the 3-bar (menu) icon > Help > Troubleshooting Information. It will open a new tab. In there, ensure you have the Include account names (possibly identifying information) box checked to refer details to their accounts and check for any additional info related to the account.
 
Also, clarify if the concerned account is added as a POP or an IMAP account in Thunderbird.
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4/21/19
Checked in Troubleshooting - checked the 'include account names' box and have looked at the details for the 3 profiles I have - the problem account is imap, not pop, and the server is shown as imap.gmail.com. I have pasted the trouble shooting results below -- the account that still works fine is xxx - the account that receives the authentication failure is xxx.  I had been using Thunderbird for all 3 accounts with no issue since November - suddenly this one account stopped working. I mentioned the power failure in my original message because I had read in someone else's issue in the community forums that the problem had occurred after a power failure, but in those cases their problem resolved itself after a few hours.  Mine has not resolved after nearly a week.  I had not made any changes to any profiles before the problem occurred.  When power was restored, the first time I tried to send email from the problem account in Thunderbird, I was asked to validate credentials by Google and have never been able to get past the message.
Last edited 4/22/19
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22 hr
setting authentication to "Normal password" instead of Oauth worked for me
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