Assuming there is not an error condition, you can take the following actions to prevent message requests from being rejected:

1. Increase the message buffer space that XCF is allowed to acquire.

   Message buffer space can be increased with the SETXCF command.

   To increase the message buffer space for message senders:

   • Increase the MAXMSG value for the transport class PATHIN definition to provide additional default message buffer space for each possible remote system.
   • Selectively increase the MAXMSG value for the transport class PATHOUT definition to provide additional default message buffer space for communicating with each possible system.
   • Selectively increase the message buffer space for the local system in a particular transport class by increasing the MAXMSG value for LOCALMSG traffic in that class.

   To increase the amount of message buffer space available for inbound messages, increase the MAXMSG value for one or more inbound signaling paths connected to the sending remote system.

   Adding signaling paths also increases the amount of message buffer space available.

2. Modify or redistribute the workload so that less message traffic is generated.

   One way to reduce message traffic is to change the characteristics of the workload. However, this might not be possible.

   The report shown in Figure 2 provides a summary of each group's impact on message traffic and can help determine which workloads (that is, groups) would be good candidates to shed or move in order to reduce the message traffic.

3. Tolerate the condition.

   You may be able to tolerate the condition if it occurs infrequently or does not degrade performance and if the multisystem applications can tolerate the condition.