Moving a BlackBerry Enterprise Server to another IP address ought to be no problem: you move the machine, change its IP and Bob’s your uncle. Sometimes. If you start up the new BES it works. But, if instead, you first use the BBsrptest utility to ensure that the BES can connect to the BlackBerry Router, you’ll be sad. The reason is a bug in BBsrptest which indicates an communications error between the BES and its router. Just start up the BES. :-)