The z/OS® NFS server supports a user-specified range of ports. The z/OS NFS server allows users to specify port assignments for services mountd, mvsmount, pcnfsd, and showattr. Additional ports are also required by the server for locking functions. The port assignments for these services can be any port number (except for reserved port 2049 for the NFS program) but must be a contiguous port range for the z/OS NFS server to identify them. The user specified range of ports provides a flexible port range to accommodate programs such as a firewall that supports a range of ports for security purposes.

Users wanting a user-specified port range setup must change the /etc/rpc file for the z/OS NFS client and the /etc/services and tcpip.profile files for the z/OS NFS server. For more information, see Setting up a user-specified port range.