Messages IST1110I and IST1280I (sense code of 08B50000) received during CP-CP session activation failure

Problem statement: Attempt to activate CP-CP session pair between end node and network node fails with sense code 08B50000, as indicated by message IST1280I.
Common symptoms: Activation of new CP-CP session pair with adjacent CP specified in message IST1110I is terminated. Message IST1110I is displayed along with message IST1280I, which displays a sense code of 08B50000.
Probable cause: The sense code indicates that the end node bringing up the contention-loser session does not require a CP-CP session pair with the network node specified in message IST1110I. The end node determined that it has an active CP-CP session with a different network node. If an end node already has a server, it will not accept a new CP-CP session with another network node.
User response: Before attempting to activate a CP-CP session pair between an end node and a network node, enter the D NET,NETSRVR,SCOPE=ONLY command at the end node to verify that no CP-CP sessions with a network node already exist.