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Problem

In addition to Debug DCD issues manual, you may face the following issue:

{
    "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": [
...]
}

Solution

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

1. Log in as the site user.

   Code Block
   language bash theme RDark
   root@linux~# su mysite

   .

2. grep in ~/etc/check_mk/conf.d/wato for snmp_v3_credentials

   Code Block
   language bash theme RDark
   OMD[mysite]:~$ grep snmp_v3_credentials ~/etc/check_mk/conf.d/wato/*

   .

3. Go to Setup → Hosts and resave the properties of the hosts and folders found in Step 2
   Image Modified
   
   
4. Repeat that for all results of step 2
   
   
5. Reschedule the DCD connection again.

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