Thread:Project:Support desk/HTTP 500 problem when trying to access mediawiki/reply (8)

The "everyone" group is a special group. Normally, the apache server run by bitnami runs under a service account, and not your user account or the Administrator account, so it has restricted permissions.

You should specifically add that group to the folder permissions and grant access. Since I don't know what user is running the server, I suggest using the "everyone" group that should include it.

I also assume your php.ini doesn't have  set, which would also cause that PHP can't write on locations outside the application directory.