Is it a known bug that Thunderbird prompts *Authentication Required* for calendar randomly at some point?
Feb 15, 1:14pm
Yes, the random "Authentication Required" prompt for calendars in Thunderbird is a known issue, especially with Google Calendar and CalDAV providers. Several bug reports and user discussions confirm this behavior, often linked to authentication token management, master password interactions, or add-ons like "Provider for Google Calendar."
Key points from the reports:
The issue is not new and has been reported across multiple Thunderbird versions, particularly when using Google Calendar or CalDAV with OAuth2 authentication.
Sometimes, the prompt appears repeatedly, even if credentials are saved in Thunderbird's password manager.
Workarounds include resetting calendar settings, removing and re-adding calendars, or adjusting privacy/cookie settings in Thunderbird.
Some users report that disabling certain add-ons (like KeeFox) or using CalDAV directly (without the Google Provider add-on) resolves the issue.
If you're experiencing this, try:
Removing and re-adding the calendar.
Checking for updates to Thunderbird, Lightning, and any related add-ons.
Adjusting cookie and privacy settings in Thunderbird.
Would you like help with specific troubleshooting steps for your setup?
Feb 15, 1:14pm
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