Hi,
i have installed a flarum forum underneith a wordpress installation. the forum directory is the sub-directory https://abc.de/forum.
The wordpress rewrite rules have affect to this. which causing that the forum is not running well. I try excluding it by adding:

location /forum {
try_files $uri $uri/ /forum/index.php?$query_string;
}

to the nginx config. but this causes a 403 forbidden to access error. I check the chmod and chown. but is not the problem. What else can i try? Or did i do mistake by using location?

Thanks for any help