On premises agent

I am currently trying out the new on premises agent.

The installation on my server worked and a connection to make could be created.
Now I would like to connect an API with basic authentication.
In my opinion, the API call looks correct and also works locally on the server.

However, Make gives me the following error code.

[
    {
        "agentId": "NONE",
        "requesterId": null,
        "connectorType": "http",
        "startDate": 1688024145362,
        "finishDate": 1688024144883,
        "body": {
            "headers": {},
            "body": "I/O error on GET request for \"https://SOME-URL-XXX/bConnect/Info.json\": PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target; nested exception is javax.net.ssl.SSLHandshakeException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target",
            "statusCode": "INTERNAL_SERVER_ERROR",
            "statusCodeValue": 500
        },
        "code": "SUCCESSFUL"
    }
]

What could be possible causes?

INFO:
The API requires that a certificate is installed on the local device. (I have done this, it also works locally).

All advice and information is welcome.
I am grateful for any answer :grinning: