If a VARY TCPIP,,SYSPLEX,LEAVEGROUP command was issued, then issue a VARY TCPIP,,SYSPLEX,JOINGROUP command to cause the stack to rejoin the TCP/IP sysplex group. If a problem was detected, prior eventual action messages explain why the stack is not a member. The problem that caused the stack to leave the TCP/IP sysplex group should be identified and corrected so that the stack can rejoin the TCP/IP sysplex group. See the information about sysplex problem detection and recovery in z/OS Communications Server: IP Configuration Guide for more information. If the problem cannot be corrected, contact the system programmer. When the stack has rejoined the TCP/IP sysplex group, the sysplex profile definitions can be reapplied.