VTAM® loaded table ISTSDCOS but determined that the named table was not a class of service (CoS) table.
VTAM deletes ISTSDCOS and initialization continues. Since the COS table does not exist, any session initiation requests that require a COS name other than ISTVTCOS or blank (for which defaults are provided) will fail.
You can issue the DISPLAY COS,ID=ISTPUS to determine whether VTAM has loaded ISTSDCOS. If VTAM has not loaded ISTSDCOS, you can issue the MODIFY TABLE command to load it.
Save the system log for problem determination.
ISTSDCOS is the name reserved for the user-written Class of Service table. You must create ISTSDCOS using the COSTAB, COS, and COSEND macros to create a valid COS table. If you want a COS table, assemble a valid version of ISTSDCOS, and reload the result into the system library. See the z/OS Communications Server: SNA Resource Definition Reference for more information.
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