[solved] Can't change global settings after installation

[romancho]

When I try to change anything in new-installed cms made simple 1.11.11 global settings page I recieve 403 error.

Permissions for /uploads, /modules and /tmp and internal folders are ok - 777.

What's the problem?

[velden]

First (wild) guess: mod_security

Ask your hosting provider if they use mod_security for your website and if so ask them to disable it or at least make it less restrictive.

Web server error log could/should give you more info.

[Dr.CSS]

Check the System information page for any yellow ! or red Xs...

[romancho]

The problem was with mod_security.
Thank you for help.