Issue was due to user error.
Always use the latest Development version from the downloads page. (Development version does not mean test / beta version)
I used this extenstion and added the code as below
$wgCategoryLockdown['English_Content']['edit'] = 'reviewer';
This must only affect the edit permission, but articles within English Content category became inaccessible to eveyone irrespective of the user group they are part of.
I get the following
You do not have permission to read this page, for the following reason:
You are not allowed to execute the action you have requested.
Hi! I just double-checked the latest version of the extension (3.1) and I couldn't reproduce your issue. That error you're getting doesn't seem to come from CategoryLockdown (CategoryLockdown throws error messages like "This action is restricted to the following user groups: reviewer"). Can you double-check that your wiki doesn't have read permissions globally restricted from LocalSettings.php or by some other extension? As explained in the docs, CategoryLockdown doesn't override global restrictions.
Hi Sorry.
Mistake in my understanding on difference between stable and developement version. Used old version.