The page replies with a 404 error and does not load the control panel for FPSE for that particular domain. I have been told that the DMZ causes the issue, but when I look for the _vti_bin folder (Full path: /_vti_bin/_vti_adm/fpadmdll.dll?page=webadmin.htm) it doesn't exist on the domains directory in IIS, so does it actually attempt to point itself to the config directory of FPSE located in (/Program Files/Common Files/..etc)?
On our other machines we use an assigned IP address (ex: 192.168.255.2) and put it in the web identities window on the domain we are making user changes to and then when we attempt to goto the config for the domain, we substitute the domain with the ip address that we added and it lets us into the domain's FPSE control panel. This is what I want to shy away from having to do because it is a pain to have to make all those changes all the time.