CICS® attempted to allocate a conversation, but no bound contention winner sessions were available.
The communications conversation has not been started.
Query your SNA product to determine whether any sessions are active to the remote system. If no sessions are active, start some. This might require restarting the remote system, or part of the network. If all available sessions are bound, but they are in use, considering increasing the number of sessions. This is configured in the mode (or session) definition both in your local SNA product and in the remote system. These "session limits" must be the consistent in both system for the connection to activate.
When sessions have been made available, rerun the intersystem request.