3286340 - Error "Message incomplete" while trying to download or upload SAP note using SNOTE

While trying to implement or manually upload any SAP note using SNOTE tool, below error is seen:

"Message incomplete (severity, area, number, or exception missing).
Message no. BL203"

Case 1: In dev_w* log:
"User XXXX is not authorized to start TP"

RFC 1764  CONVID 89023329
 * CMRC=6 DATA=0 STATUS=0 SAPRC=676 ThSAPOCMINIT
RFC> ABAP Programm: SAPLCRFC (Transaction: SNOTE)
RFC> User: XXXX (Client: XXX)
RFC> Destination: %_TCPIP_%1 (handle: 3, DtConId: 63AD1B012EBE0EA0E10080000A4221CB, DtConCnt: 0, ConvId: ,)

Also, perform TCP/IP connection test in sm59 and the connection test failed will fail with Return code 676

Image/data in this KBA is from SAP internal systems, sample data, or demo systems. Any resemblance to real data is purely coincidental 

                                                                                     OR 

Case 2: Below error message is seen in work logs while downloading SAP Note via SNOTE:

SAPXPG_START_XPG_LONG: sy-subrc: 1006 number of retries =  1
"RFC error message: command Y:\usr\sap\<SID>\XXX\exe\SAPCAR not allowed"

Case3: Just after the error you can find in work directory in dev_rfcx trace error message:

Error RFCIO_ERROR_SYSERROR in D:/depot/bas/754_REL/src/krn/rfc/abrfcpic.c : 1779
CPIC-CALL: 'ThSAPOCMINIT', communication rc: CM_PARAMETER_ERROR (cmRc=19), taskhandler rc: GW_SNC_START_EXT_DIS (thRc=730)
Not allowed to start non-SNC connections 

OR

Error RFCIO_ERROR_SYSERROR in D:/depot/bas/754_REL/src/krn/rfc/abrfcpic.c : 1779
CPIC-CALL: 'ThSAPOCMINIT', communication rc: CM_PARAMETER_ERROR (cmRc=19), taskhandler rc: GW_SNC_START_EXT_DIS (thRc=730)
Starten von nicht SNC-Verbindungen ist nicht erlaubt

• SAP Note Assistant (SNOTE)
• SAP Netweaver ABAP

SNOTE, NOTE, Download, Upload, Message incomplete, (severity, area, number or exception missing), BL203, User, not authorized to start TP, rfcecec on host, Return code 676, TCP/IP, SAPXPG_START_XPG_LONG, sy-subrc: 1006, RFC error message, command, SAPCAR not allowed , KBA , BC-UPG-NA , Note Assistant , Problem