By default, the ParaStation MPI daemon psid(8) uses the port 888 for TCP connections. To change this port, modify the files /etc/services and /etc/xinet.d/psidstarter.

Add the following line to /etc/services:

  psid    888/tcp     # ParaStation Daemon Start Port

and change the default port number 888.

Modify the entry

          port            = 888

within the file /etc/xinet.d/psidstarter to reflect the newly assigned port numbers.

In addition, the ParaStation MPI daemon psid(8) uses the UDP port 886 for RDP connections. To change this port, use the RDPPort directive within parastation.conf. See parastation.conf(5) for details.

The port numbers must be identical on all cluster nodes! Restart xinetd and psid on all nodes to activate the modifications.