Host Print Service Stops Responding After Invalid SCS Code

   Event ID: 21
   Source: SNA Server
   Description: (1124) Negative Response Sent on Connection <connection
   name>
                        (SENSE = 1005)
					

MORE INFORMATION

Print service internal traces that are captured when this problem occurs may include data similar to the following:

   INTRN SNAP-3270   S3PR1DAT            HPBYTE                  43
   INTRN SNAP-3270   S3PR1DAT            START OF SHF/SVF/SLD
   INTRN SNAP-3270   S3PR1DAT            CONTINUE
   INTRN SNAP-3270   S3PR1DAT            HPORDER                 2
   INTRN SNAP-3270   S3PR1DAT            PRTDSTRT                2872
   INTRN SNAP-3270   S3PR1DAT            HPBYTE                  131
   INTRN SNAP-3270   S3PR1DAT            SHF/SVF/SLD 2ND BYTE    83
   INTRN SNAP-3270   S3PR1DAT            EXIT
   INTRN SNAP-3270   S3PRDSCS           SCS DATASTREAM ERROR
   INTRN SNAP-3270   S3PRDSCS           EXIT
   INTRN SNAP-3270   S3PRRSCS           ENTRY
				

With the fix applied, the SNA Server host print service correctly handles invalid SCS control codes; the print service does not get into the loop that causes it to stop responding. The updated print service prints everything contained in the print job up to the invalid SCS control code. After the invalid SCS control code, the print service notifies the printer that the print job is finished.