Please execute the following query in phpMyAdmin or a similar tool. Report the output here.

SELECT forum_enabled FROM [your_settings_table_name]

Tschö, Auge

Servus Auge,

The query results in an error message:

But table mlf2_settings contains a field named forum_enable currently with value 0, see fig. below:

I am not completely sure, but I mean the on/off function was in my installation already ineffective before the update to 2.4.3. Previously, 2.4.2 was installed. During updating to 2.4.2, this I know exactly, the on/off worked proper.

Housten, any idea?