What Port number needs opened on firewall for exchange 2007 autodiscover setup

[genesis]

Hi

 

I am in a process of setting up autodiscover on Exchange server 2007 for office 365 staged migration . Our Firewall is hosted with our LA and please let me know the ports that I need to open on the firewall for (autodiscover setup) the IP that points to our Exchange server.

 

Any help would be great .Thanks in advance