I've recently installed FM AdvPro 11 on a local PC. I go into the 'File' -
'File Sharing' - 'IWP' menu then click on the 'Specify' button to change the
default port from 37954 to our normal one for development (which has worked
without flaw since version 8.5). When I click OK it takes a long time to
return to the IWP dialog box.

I cannot access the app via IWP and when I go back into the IWP setup the
port has been reset to the original default of 37954 preceded by 6449 (so
the url becomes http://192.168.123.123:644937954/).

Any ideas on why this may be happening?