This TCP/IP error message -
ESP2215E InitApi MaxSoc=50, Process initialization error, Task=007200
usually means that the SAF user ID associated with the ESP master STC does not have a proper OMVS segment defined to it. This may happen if the ESP master started task name is inadvertently associated with a default STC SAF user ID that has no OMVS segment. Or if the ESP master started task name is assigned to the correct ESP STC user ID, then this SAF user ID needs to have a proper OMVS segment defined to it.
Assuming your security system is RACF and ESP's SAF user ID is STCESP, one can check if it has an OMVS segment associated with it by issuing the following RACF TSO command -
LISTUSER STCESP OMVS
If there is no OMVS segment, then a RACF TSO command such as the following would be required -
ALTUSER STCESP OMVS(AUTOUID HOME(/) PROGRAM(/bin/sh))
Of course only a security administrator is normally authorized to issue such commands.