Sense code 08210002 received with session activation failure

Problem statement

Session activation failed with the sense code 08210002.

Common symptoms

An attempt to establish a session failed with the sense code 08210002 (mode name not valid).

Probable cause

The sense code indicates that the logon mode name associated with the session request was not found in the table or in the default logon mode table (ISTINCLM).

User response

Verify that the requested logon mode name is defined as follows:

In a subarea-only environment, the mode name must be defined in the SSCP associated with the SLU.
In an APPN-only environment, the mode name must be defined in the origin and destination nodes, as well as the origin and destination node servers if the origin or the destination is owned by an end node.
In a combined APPN and subarea environment, the mode name must be defined at the APPN node that owns the origin or destination, at the node server if it is an end node, and at the interchange nodes that represent the subarea entry point. If the SLU is owned by a subarea node other than the interchange node representing the subarea entry point, the mode name must also be defined on the owning subarea.
Note: Because mode table names are not carried on APPN line flows, a user-defined mode table is used only at the SSCP for the SLU. Other nodes defining the mode must define the SLU in the default logon mode table.

Refer to z/OS Communications Server: SNA Network Implementation Guide for details on mode to CoS resolution in an APPN or in a combined subarea and APPN environment.