6.2.1.3 ISV Server open File Limits
ISV servers on Unix platforms will attempt to increase their open file limit. If a server is able to increase its open file limit, a line similar to the following will appear in the debug log when the server first starts up:
mm/dd hh:mm (isvname) File descriptor limit increased from 256 to 65536
If you do not wish the ISV server to unlimit its open descriptor limit, set the RLM_NO_UNLIMIT environment variable in the process where you run the server:
% setenv RLM_NO_UNLIMIT anything