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Cribl HTTP/S Source Receiving 403 Response When Pushing JSON Data

  • January 31, 2026
  • 4 replies
  • 7 views

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Hi. I created a raw HTTP/S source in Cribl on port 10081. When a .NET client tries pushing JSON data to the endpoint a 403 response is received. It's not an issue with proxies/firewalls and not due to any problems with auth tokens. We aren't having this issue using our other sources in Cribl Cloud. Has anyone run into similar issues and if so, how were they resolved?

Best answer by Brandon McCombs

you can create new inputs in Cloud but can't configure just any port. Ports are available for custom inputs in the range of 20000-20010. If you want to reuse a default port with a custom input (to use a different name, for example) then you can but must disable the default input first that is using that port.

4 replies

Jon Rust
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  • Employee
  • January 31, 2026
Did you commit and deploy?

Jon Rust
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  • Employee
  • January 31, 2026
The RAW HTTP source will accept literally any HTTP data. There are not checks or verifications.

you can create new inputs in Cloud but can't configure just any port. Ports are available for custom inputs in the range of 20000-20010. If you want to reuse a default port with a custom input (to use a different name, for example) then you can but must disable the default input first that is using that port.

  • Author
  • New Participant
  • January 31, 2026
Adjusting the ports fixed it. Thanks!