Originally Posted by OnlyGODSanExpert
To remove the firewall restriction, complete the following steps:
On your BlackBerry smartphone, go to Options > Security Options > Firewall.
De-select Enterprise Messaging.
If this does not work, turn off the firewall by selecting Disable in the Status field. If you are not able to turn off the firewall, contact your IT Administrator as there is an IT policy restricting your firewall settings.
It would be much more recommended to use the FAQ:
BBFAQ: Remove IT Policy