CB Response: Sensors Unable to Register with DNS Resolution Error
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CB Response: Sensors Unable to Register with DNS Resolution Error


Article ID: 289136


Updated On:


Carbon Black EDR (formerly Cb Response)


  • Sensors fail to register or appear offline in the console
  • Sensor diagnostics Server.log shows: 
    Tid[1B8C] 2019-03-03 19:41:29 (w): Failed to registerHTTPCode[0] HrError[0x80C80006] 
    Tid[1B8C] 2019-03-03 19:41:29 (i): failed to register HrError[0x80C80006] 
    Tid[1B8C] 2019-03-03 19:41:29 (w): Unable to properly synch with server HrError[0x80C80006] 
    Tid[1910] 2019-03-03 19:41:35 (e): CreateFile failed Device[\\.\cbndisim] IOCTL[62430004] WinError[0x00000002] 
    Tid[20E0] 2019-03-03 19:41:35 (e): Unable to parse DNS response HrError[0x80070057]



  • CB Response Sensor: All Supported Versions
  • Microsoft Windows: All Supported Versions


  • Potential networking/DNS resolution issue between the sensor and the Master server


  • Validate that the DNS URL used for the 'HKLM\Software\Carbon Black\config\SensorBackendServer' registry value is able to be successfully resolved on the endpoint.
  • Validate networking allows communication to the DNS URL for the Master server to allow the system to register.

Additional Information

  • Error code 0x80C80006 means: 0x80C80006: Facility[CURL] Code[0006] Severity[1] Couldn't resolve host name. 
  • Error code 0x80070057 means: 0x80070057: Facility[WIN32] Code[0057] Severity[1] The parameter is incorrect.