Mozilla will shut down Pocket’s services on July 8, 2025. At that time users will no longer be able to access the Pocket website, apps and API. You can export your saved items and API data until October 8, 2025 before they are permanently removed. For more information, see this article.

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

Failed to connect.

  • 2 replies
  • 1 has this problem
  • 22 views
  • Last reply by Bruce

When I run Thunderbird I'm getting the message "Failed to connect to server. mail.supremecluster.com". This was a mail server at one stage but now all my email accounts are on a completely different server. All there configs are correct and I receive mail but this message keeps popping up and I can't find it in any of the settings.

When I run Thunderbird I'm getting the message "Failed to connect to server. mail.supremecluster.com". This was a mail server at one stage but now all my email accounts are on a completely different server. All there configs are correct and I receive mail but this message keeps popping up and I can't find it in any of the settings.

Chosen solution

I deleted an account that no longer had a server. It was on mail.supremecluster.com previously but had no longer had any visible info about that domain. Surprisingly, the warning message has stopped.

Read this answer in context 👍 0

All Replies (3)

Was it a calendar on the sever perhaps. Folks appear to forget that calendars use authentication.

Thanks for your reply. I looked at calendar properties. It did not mention mail.supremecluster.com I turned the "Home" calendar off anyway but the error message still appears.

Chosen Solution

I deleted an account that no longer had a server. It was on mail.supremecluster.com previously but had no longer had any visible info about that domain. Surprisingly, the warning message has stopped.