an error occurred during connection to localhost
I have been using T-bird as my email client for years. Just now, a new screen pops up with this message: "an error occurred during connection to localhost". I have 2 email accounts that I use with T-bird. The one is with comcast; it is the account that comes up with the error message. The other account is with Breezeline, and it appears to be unaffected. However, and this is the problem, I cannot send or receive email from either account. I am going to try to send both a hard copy of the error message, and the data from the T-bird program that I am using. Your help is appreciated. Thanks
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Thunderbird isn't involved in any 'localhost' connections, using only the server settings provided. You might check with email provider for an update on this.
The account that I had that failed this was an IMAP account - I also have a POP version of the same account and it works fine. This happened in the past several hours and there were no changes to the account settings before this occurred. I even deleted the IMAP account after the error and attempted to reinstate it, but it consistently fails when trying to recreate it; this failure occurs with either the automated or the manual settings processes.
When the error occurs I get the same popup as the OP, and the address it says it is failing on is: https://localhost/?code=0.ac.e1.0FedrV No idea who or what is attempting to access localhost, whether it is Thunderbird or Xfinity when authorizing and/or executing, but SOMETHING is attempting it.
Like the OP I have been utilizing Thunderbird for years and this particular account was working fine until some time this morning. Rebooting and altering firewall rules had no effect.