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503 ServiceUnavailable error

Hi,

I am trying to hit the below end point and I am receiving the 503 error message in Apigee,

Endpoint: http://86.105.154.13:8083/datasnap/rest/TServerMethods/GetEmployeeData

{
    "fault": {
        "faultstring""The Service is temporarily unavailable",
        "detail": {
            "errorcode""messaging.adaptors.http.flow.ServiceUnavailable"
        }
    }
}
 
When I am testing the endpoint directly in postman, I am getting 200 success. But when I configure this endpoint in APIGEE I am receiving 503.
Attached the screenshot of trace session.
 
Please help to find the cause of error.
Note: This API was working fine before in APIGEE, I am recently facing this issue.
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