STA0011E

STA0011E  Session established. Local address: nnn.nnn.nnn.nnn  Remote address: nnn.nnn.nnn.nnn
Explanation:
This is an unrecoverable error message. The port is in use by hosts at the addresses given.
Issued by:
TAURIP17
System administrator response:
The MVS command D TCPIP,TCPIP,N,CONN,PORT=nnnn will show which job is using the port.