Incorrect access detected, this server may be accessed only through "http://192.168.2.2:8181/moodle" address, sorry. Please notify server administrator.

Hello, 

I am facing a problem when I try to access moodle from an external network (Internet), I installed moodle on Windows server 2012 R2, on a WAMPApache server on the localhost, When I try to access it from the internet I face this error, "Incorrect access detected, this server may be accessed only through "http://192.168.2.2:8181/moodle" address, sorry. Please notify server administrator." Every this is fine on the TMG roles, and I made a port forward on the routers, Every time I receive the redirect message, when I click redirect it tells me that, the page unavailable.

Please I need an urgent help in this.