First, UIProxy is only needed when using the Java GUI. Support for this has gone away as of DP 8
If you are not using the Java GUI, I suggest that you edit the 'global' file on your cell manager
UNIX:
/etc/opt/omni/server/options/global
Windows
Program Data -> Omniback -> Config -> Server -> Options -> global
Find this line:
# DisableUiProxy
Make a copy of this line, edit one of the lines to remove the # sign and the 'space' that follows, and set it equal to '1'
DisableUiProxy=1
# DisableUiProxy
Save the file, stop and restart DP