USSMSG07
luname UNABLE TO ESTABLISH SESSION — runame FAILED WITH SENSE sense

Explanation

This message is issued for one of the following reasons:
  • A valid logon request was entered and forwarded to an application program, but one of the following occurred:
    • The application program rejected the logon request (by issuing a CLSDST instead of an OPNDST macro).
    • The logical unit rejected the application program’s OPNDST macro (by returning a negative response to the BIND request sent by OPNDST).
  • The session initiation request was for a cross-domain session. The required SSCP-SSCP session is not active. This might be due to failure to define, activate, or define and activate the host CDRM statement or the CDRM statement for the external CDRM.
  • The session initiation request was for a cross-domain session, and the required CDRSC definitions had not been activated.
  • No route was available to support the requested session.
  • The COS name requested for the session was not defined in the COS table associated with the PLU’s domain. (A COS name is selected from the logon mode used for the session.)
  • The SSCP of either the PLU or the SLU detected a logic error that prevented session setup (for example, a duplicate network address has been assigned).
  • The interpret table recognized an error involving a logon command. The logon command, as entered, cannot be used to establish a session with the application program.

luname is the node (known to VTAM®) from which the logon request was entered.

runame is the type of initiation RU being processed. runame will be SETUP when the RU cannot be determined at the time of the failure. If runame is SETUP, the session could have been terminated during session setup. See Command and RU types in VTAM messages, for more information on RUs and command types.

sense is the 8-digit hexadecimal sense code set at failure time. See z/OS Communications Server: IP and SNA Codes for more information on sense codes.

System action

The command is not executed. No session is established between the application program and the logical unit.

Operator response

It is possible that the application program cannot accept the session parameters specified by the logon mode name in the LOGON command. It is also possible that the logical unit cannot accept the application program’s substituted session parameters. In this situation, a LOGON command specifying a different logon mode name might work. It is also possible that the LOGON command is unrecognized because a proper value was not defined in the interpret table.

This message is generally evidence of improper design of either the application program, the USS table, or the logical unit’s application program. Provide the luname, runame, and sense values to the system help desk.