kubernetes - Prometheus - Not able to probe tcp end -

i have setup prometheus , blackbox check liveliness of services , working fine http targets not working tcp one.

if try probe service using curl http://blackbox:9115/probe?target=mongodb:27017&module=tcp

it gives me output as
probe_http_status_code 200
probe_http_content_length 84
probe_http_redirects 0
probe_http_ssl 0
probe_duration_seconds 0.310101
probe_success 1

but not able same result using prometheus job. prometheus ui shows status down error "server returned http status 400 bad request"

job configuration

    - job_name: 'mongo-service'       scheme: http       metrics_path: /probe       params:            module: [tcp]       static_configs:                - targets: ['mongo-svc:27017']       relabel_configs:       - source_labels: [__address__]         target_label: __param_target         replacement: ${1}       - source_labels: [__param_target]         regex: (.*)         target_label: instance         replacement: ${1}       - source_labels: [ ]         regex: .*         target_label: __address__         replacement: blackbox:9115 

that works fine me. sure you're talking same blackbox exporter in both cases?

i'd suggest using tcpdump see error is.