If you are able to connect to it from inside your network, then the problem is with the network configuration, and that is a bit way out of scope to try and debug on a blog.
To me it seems that something is filtering the request, and depending on the version of RMS, you will need more then just the 2 above ports open.
To me it seems that something is filtering the request, and depending on the version of RMS, you will need more then just the 2 above ports open.
CyberXing