Dear Guys!
I have been searching the solution for days. Let me tell you the solution I found. Whenever I cahnged the permalinks to other than default it always errored 403 problem.
The solution is very easy. Delete the .htsccess file from the root of your website html directory and make a new file, named: .htaccess
Leave it blank, just make it. It will work. I think my host provider has got problem, but it is a very big online company so might happen to any of you.
All the best!
