What Web Proxy port to choose from ?

Hi all,

I have a full and functional TMG Farm ready to be implemented for my client that will substitute actual ISA Server 2006.<o:p></o:p>

We choose to use web proxy port 3128 rather than 80, just to make things better than using the old 80 port. My client wants to stick up with port 80 and i need some official documentation which can prove that the best practice is to use a different port, due to security reason, etc. I read in the past some information that complies with me thought.

Thank you in advance,

Best regards,

Luís Carmo