User account keeps connecting and disconnecting

[Anwaar Sadat Shaibu]

Dear team, I would be glad to have your support on this. My user's bind keep going on and off. Here are some logs I can find.

 1 Unknown Error: Field must be null

Traceback (most recent call last):

  File "/usr/local/lib/python3.11/site-packages/smpp/twisted/protocol.py", line 211, in rawMessageReceived

    pdu = self.encoder.decode(BytesIO(message))

          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

  File "/usr/local/lib/python3.11/site-packages/smpp/pdu/pdu_encoding.py", line 1038, in decode

    self.decodeBody(file, pdu, headerParams['command_length'] - self.HEADER_LEN)

  File "/usr/local/lib/python3.11/site-packages/smpp/pdu/pdu_encoding.py", line 1080, in decodeBody

    mandatoryParams = self.decodeRequiredParams(pdu.mandatoryParams, self.getRequiredParamEncoders(pdu), file)

                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

  File "/usr/local/lib/python3.11/site-packages/smpp/pdu/pdu_encoding.py", line 1190, in decodeRequiredParams

    params[paramName] = encoderMap[paramName].decode(file)

                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

  File "/usr/local/lib/python3.11/site-packages/smpp/pdu/pdu_encoding.py", line 99, in decode

    raise PDUParseError("Field must be null", pdu_types.CommandStatus.ESME_RUNKNOWNERR)

smpp.pdu.error.PDUParseError: Unknown Error: Field must be null

2025-10-28 06:20:36 CRITICAL 1 Received unparsable PDU b'0000003580000005000000000000000135343334666563642d373466352d343036342d386562352d35363538616434343136336200'