0x0068000A (6815754) The memory was not allocated.

Explanation
The data server was unable to allocate memory for a TCP/IP session.

User response
The global MESSAGEPOOLSIZE configuration parameter needs to be updated to increase the amount of memory that is 
available to the data server. The data server needs to be stopped and restarted for the new setting to take effect.

Refer to the MESSAGEPOOLSIZE configuration parameter documentation regarding the z/OS REGION size and the amount of memory that needs 
to be reserved for system usage versus the message pool.