External communication

Define the following ports to your firewall protecting the z/OS® host, as they are used for client-host communication (using the tcp protocol):
  • RSE daemon for client-host communication setup, default port 4035. The port can be set in the rse.env configuration file. Communication on this port can be encrypted.
  • RSE server for client-host communication. By default, any available port is used, but this can be limited to a specified range with the _RSE_PORTRANGE definition in rse.env. The default port range for _RSE_PORTRANGE is 8108-8118 (11 ports). Communication on this port can be encrypted.
  • (optional) TN3270 Telnet service for the Host Connect Emulator, default port 23. Communication can be encrypted (default port 992). The default port assigned to the TN3270 Telnet service depends on whether or not the user chooses to use encryption.
  • SSH service for the SSH terminal, default port 22. Communication is encrypted.