Permalinks Structure and 403 Forbidden error

While waiting for Brazil and Crotia match (in Malaysia the game start at 3 am), I try to fix my site permalinks structure problem. Actually this problem happen last week, I’m not sure when it started. Before or after I upgraded my WordPress. I don’t think this problem caused by my plugin because I have try diactivated all the plugins but nothing help there.

The problem is, if I go to this link:

I will get 403 Forbidden error page and I can’t view my posts on that day. But if I remove the forward-slash, I can view and see the posts. Like this:

In WordPress Support, one of the members suggested me to reinstall my website. He thought maybe there is something isn’t connect in my database. I did but I tested in another database. I just change database name in wp-config.php and install new database. But the problem still happen although with a fresh install.

I also have asked my hosting provider and they said, from their experiences I need to edit .htaccess file. I don’t know what to edit so I just delete .htaccess file (WordPress will create new one when this file got deleted) but still get 403 error page.

And now, I don’t know what to do… Does anyone ever had this problem before? How did you fix it? 🙁 [tags]wordpress support, permalinks[/tags]