CMS Chameleon mod_security

Job ID: 31485468

Budget: €8 – €30 EUR

After clicking on the icon of my site to "LOGIN/SIGNUP VIA GOOGLE PLUS", it goes to a page 403 error unauthorized.
Dev of the CMS told me : "Please ask hosting disable mod_security or other tools that can block url params."
But i don't want to disable mod_security, but maybe add an exception?
Related categories: PHP Web Security