Analysis

Table 1 shows symptoms of session outages and refers to the steps needed for initial diagnosis of the error.

Table 1. Symptoms of session outages
If this is the outage type	Then perform these steps
TCP/IP session outage	If the TCP/IP console shows a TCP/IP error message, see z/OS Communications Server: IP Messages Volume 2 (EZB, EZD) and follow the directions for system programmer response for the message. If TCP/IP abended, see Diagnosing abends, loops, and hangs.
SNALINK LU0 session outage	If the SNALINK LU0 console shows a SNALINK error, see the explanation of the corresponding error message as described in z/OS Communications Server: IP Messages Volume 1 (EZA) or z/OS Communications Server: SNA Messages. For more information about diagnosing SNALINK LU0 session outages, see Diagnosing SNALINK LU0 problems.
NCPROUTE-to-NCP client session outage	If the NCPROUTE console shows an NCPROUTE error message, see z/OS Communications Server: IP Messages Volume 2 (EZB, EZD) and follow the directions for system programmer response for the message.
NCPROUTE-to-SNMP agent session outage	If the SNMP agent console shows an SNMP error message, see z/OS Communications Server: IP Messages Volume 2 (EZB, EZD) and follow the directions for system programmer response for the message. For more information about diagnosing SNMP problems, see Diagnosing Simple Network Management Protocol (SNMP) problems.

You can now perform the steps for the decision you have made.