Happy new year to all!

Does anyone know if iFolder client needs any ports other than 80 and 443 to work from outside the firewall? I have a client who's NATed behind the firewall and even though I've forwarded the following ports, they still can't connect from outside? From with the LAN, no problem, what gives?

Ports forwarded: 80, 52080, 443, 52443, 636, 389

I've checked and the iFolder .conf file says it's using 80 and 443; does the client needs any other ports?