Network connection loss problems
SNA network connection loss can be either expected or unexpected. This section deals with unexpected connection problems. The definitions of expected and unexpected losses are described before continuing with the analysis for unexpected loss.
Connections for the SNALINK LU6.2 address space can be configured to be normally active or normally inactive. The normally inactive configuration is used when there is a cost involved with the network connection time. Normally inactive connections are expected to experience connection establishment and loss regularly with use. Because of this, the SNALINK LU6.2 address space does not write messages to the MVS™ system console for connection loss. Connection loss for a normally active connection is unexpected. In this case, the SNALINK LU6.2 address space writes connection loss messages to the MVS system log.
When a connection is configured with the INIT parameter on the DEST statement and a timeout value of zero on the LINK statement in the SNALINK LU6.2 configuration data set, the connection is a normally active connection.
When a connection is configured with the DATA parameter on the DEST statement and a nonzero timeout value on the LINK statement in the SNALINK LU6.2 configuration data set, the connection is a normally inactive connection.
Check the connection that is experiencing the loss to ensure that the loss is unexpected. If the connection loss experienced is caused by errors, the loss is unexpected regardless of the connection configuration.