After login and logout (which work perfectly) it redirects me to another link which is 'blocked'

Going to the login page works fine, as does login in, but after the login or when I push the logout button it redirects me to another page wich always gives me an error.

I get this error on the redirected page after login or logout:

“demo” links are blocked

The webpage at demo:// might be temporarily down or it may have moved permanently to a new web address.