Sense code 8008

PU not active: The SSCP-PU secondary half-session in the receiving node has not been activated, and the request was not ACTPU for this half-session; for example, the request was ACTLU from an SSCP that does not have an active SSCP-PU session with the PU associated with the addressed LU.

Bytes 2 and 3 following the sense code contain sense code specific information.
0001
A physical unit name was specified for an independent LU session tail. The specified PU is either unknown or in a state that is not valid.
0002
No ALS (adjacent link station) list was provided for an independent LU. You must define an ALS for an independent LU if you want to use VARY LOGON and LOGAPPL for the independent LU. You can also use VTAM® functions to dynamically determine an ALS.