Debug Attach Server

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# Debug Attach Server

The error messages described here can occur during attached debugging in a mainframe environment.

For error analyses, you can also check the output of the `TRACE` option set with the `DBGAT` profile parameter (see the Parameter Reference documentation).

Code | Module | Explanation
--- | --- | ---
NAT1999 | NATATDBG | Module for CICS loaded in a non-CICS environment. Ret 12. `RCALIAS=(NATATDBG,NCIADvrs)` was used in a non-CICS environment. Or: Wrong module loaded in CICS environment. Ret 12. `RCALIAS=(NATATDBG,NCIADvrs)` was not used in a CICS environment. Or: Physical connection failed. Ret 12. There is either no TCP transport layer available or the TCP/IP listener is missing on the host and port provided in the `DBGAT` parameter. Or: Logical connection failed. Ret 12. The listener on the host and port provided in the `DBGAT` parameter is not an attach debug server.