Joomla 4 Extensions Updater shows the following warning at the top of the page:

Update: Could not open update site #59

Update: Could not open update site #59 "Lab5 - Update Server (lab5_captcha)", URL:

 This doesn't affect functionality, other extensions are updated with no issues. The update site in question is not showing in System > Update Sites.




The update site URL was a leftover from an old broken extension (Lab5 CAPTCHA) which had been removed manually. A quick search in Joomla's database revealed that it was coming from the _update_sites table. I was going to remove the offending entry from the database manually, but before doing that I tried clicking "Rebuild" button in System > Update Sites.

System > Update Sites > Rebuild

This fixed the issue without having to manually mess with the database (the entry was removed _update_sites table by the "Rebuild" process).

September 2023
Joomla 4.3.4


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