This error page is generated by your web server and not WordPress. Check your file permissions:
Changing File Permissions
Also, make sure there is .htaccess file
Yeah, There is .htaccess file in file manager.
I changed permissions, but I get still same message: Forbidden
Server Administration told, that I have all rights what I need to manage Data Base with full permissions!
I changed permissions, but I get still same message: Forbidden
I observed one strange thing, first time my wordpress CMS site had on 000webhostapp (https://european-education.000webhostapp.com/) there it’s working very well, next I moved my web-site into new server (http://www.internationalacademy.ge/) and some problems start….
If the problem appears only after you did that, there might be a file permission issue or a bad configuration.
It looks like you’re blocking access to /wp-admin/admin-ajax.php
http://www.internationalacademy.ge/wp-admin/admin-ajax.php
You’ll need to remove the block (whitelist, etc.) as plugins, themes, even WordPress itself needs to access that file. (Or as someone previously mentioned, you may need to check the file permission/ownership setting for that file and possibly other files in that directory. Though I’m able to access at least one other PHP file directly, in the web-root, without any issue.)
The easiest way to find out what files are getting 403’d (Forbiddens) is to look at the server access logs. if the server access logs are very long, you’ll have to refine the search to 403 or/with something additional.