Let me qualify the question: The environment is an OS/390 system running DB2 communicating to a Brio reporting environment on AIX using DB2 ODBC drivers. This environment currently runs in the same subnet/hosting site. We're looking into moving the Brio environment to another hosting site. The move will introduce one or more firewalls between the OS/390 system and the Brio system. I'm concerned about how ODBC will work through the firewalls. I've read several postings elsewhere warning about how unsafe it is to open ports for the comm protocols on top of which ODBC rides. Thanks in advance for any word of advice.