CLIENT_PORT_WINDOW entry in vm.conf
Use this entry to specify the range of non-reserved ports on this host that are used to connect to vmd on other hosts. This entry is read and interpreted on the host on which vmd runs.
CLIENT_PORT_WINDOW = start end
For example, the following entry permits ports from 4800 through 5000:
CLIENT_PORT_WINDOW = 4800 5000
The operating system determines the non-reserved port to use in the following cases:
A CLIENT_PORT_WINDOW entry is not specified.
A value of zero is specified for start.