If use of the loopback address is not acceptable, determine which TCP/IP stack the SNMP agent has affinity to. Verify that the TCP/IP stack's TCPIP.DATA data set has a valid HOSTNAME statement. The TCP/IP stack configuration component uses the z/OS® UNIX search order to locate the TCPIP.DATA HOSTNAME statement to determine the stack host name. See search orders used in the z/OS UNIX environment in z/OS Communications Server: IP Configuration Guide for a description of this search order. This host name value is the value that is returned on gethostname socket function calls processed by the stack.