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Code Block
    "title": "Server was about to send an invalid response.",
    "status": 500,
    "detail": "This is an error of the implementation.",
    "ext": {
        "errors": {
            "snmp_v3_credentials": [
                "Unknown field."
        "orig": {
            "id": "host",
            "domainType": "host_config",
            "value": [


  1. snmp_v3_credentials" is no longer used by checkmk and therefore MUST be removed for the API to work.

  2. Log in as site user
  3. grep in ~/etc/check_mk/conf.d/wato for snmp_v3_credentials
  4. Go to Setup → and resave the properties of the hosts and folders found in step 2
  5. Repeat that for all results of step 2
  6. Reschedule the DCD connection again