Necessary Ports and 9.1C

For security reasons, our company is trying to close down unnecessary
ports on our server that runs the Progress database for Vantage. In
addition, we want to keep the ability to use the Progress 9.1C ODBC
driver. Other than the port that was defined in Progress Explorer
program for our separate SQL server group, what other ports are
needed for the Progress 9.1C ODBC Driver to run correctly?