The systems must have one of the following protocols enabled. Ensure that the port that the protocol uses is not blocked by a firewall. Secure shell (SSH). Ensure that the port is set to the default value, 22. Remote shell (RSH). Remote Execution Protocol (REXEC). You must be able to log in to the V6.1 system with the user ID that you created for the server instance, using the SSH, RSH, or REXEC protocol. When using the wizard, you must provide this user ID and password to access that system.