403 Forbidden error message keeps popping up

[agent47]

Link to my site: http://www.superheroalliance.net
SMF version: 2.0.2
TP version: TP 1.0
Default Forum Language: English
Theme name and version: laGusta 2.x
Browser Name and Version: Chrome & FF
Related Error messages:

Forbidden

You don't have permission to access /index.php on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

Apache Server at www.superheroalliance.net Port 80

Can someone please be kind enough to tell me why this browser error keeps popping up when I try adding some blocks ? Is there an issue with my server?

[Maxx1]

Agent, I think you may have to check your file permission settings on web hosting service, this can be changed by you if you know what your doing, if not contact you host with the details, to site if they change the proper (read write)
settings?  (chmod) At least it looks this way!

Note Chances are you'll need to contact your Host!

You can read up more on this at: http://www.stadtaus.com/en/tutorials/chmod-ftp-file-permissions.php

regards,
Maxx

[IchBin]

It's probably related to a server configuration change or something. It might have something to do with mod_security. You'll need to work with your host to see if they have it enabled, and to see if they can get it to work by disabling it.