I don't believe you can change the port that FMServer listens to for IWP.
However, you can use port-mapping techniques to fake it. For example, most internet routers can do port mapping (mapping one WAN port to an different LAN port). Also, webserver software can often do this, too. I would guess that IIS can do it but I'm more of an Apache/Mac person myself.
In fact the default port is 80. And I need to serve 2 websites on that machine that cannot afford to use a diferent port then 80.
I guess that if I do a port mapping on 80 I wont solve that in fact I need the 80 for web and need another port for FMS11.
I have been reading a lot on google and find nothing about that.
Guess may be I dont understand correctly the whole stuff.
Anyway, thanks for helping and if U have any other idea... :-)