I have iPrint set up an running on my internal network successfully. I am now trying to set things to be able to print to these printers from anywhere on the internet. I thought that all I had to do was make sure that port 80, 443, and 631 were redirected to the server that is running the NDPSM. The printers are set up using the DNS name and the name resolves correctly over the internet. I can telnet to port 631 from the internet and get the same response as telnetting from the internal network. Is there something else that I need to do?