Messages IST1110I, IST1356I, and IST1280I (sense code 101E000A) received during CP-CP session activation failure

Problem statement: Attempt to activate CP-CP session pair between end node and network node fails.
Common symptoms: Activation of new CP-CP session pair with network node specified in message IST1110I is terminated. The operator at the end node sees messages IST1110I, IST1356I, IST1280I, and IST314I. IST1280I displays the sense code 101E000A.
Probable cause: The end node's network node server list entry for the network node failed to specify SLUINIT=OPT or, in the absence of an explicit entry for that node, the nameless entry failed to specify SLUINIT=OPT. The network node is probably an AS/400®, NS/2, or Personal System/2 computer, none of which provides the network node server capabilities provided by VTAM® network nodes. CP-CP sessions between VTAM end nodes and such network nodes are allowed only if the end node's network node server list specifies SLUINIT=OPT.
User response: Modify the network node server list to specify SLUINIT=OPT on either the explicit entry for the required network node server or on the nameless entry. Activate the modified network node server list definition deck, and then reactivate the session.