Based on the information provided in the knowledge sources, I can offer some insights into your issue with the

/health/alive

endpoint returning a 400 status code. However, it's important to note that a 400 status code is not the expected behavior for this endpoint. According to the [Ory Hydra documentation](https://www.ory.sh/docs/hydra/faq#how-can-i-test-if-my-4445-is-running-properly), the

/health/alive

endpoint should be used to check if Ory Hydra is alive. Typically, this endpoint should return a 200 status code if the service is up and running. There are a few things you can check: 1. Ensure you're using the correct port. The administrative API (which includes health checks) typically runs on port 4445. Make sure your Kubernetes service is configured to route traffic to this port correctly. 2. Check if you're using the correct URL path. The full path should be

http://[your-hydra-service]:4445/health/alive

. 3. Verify that your Ory Hydra instance is running properly. You might want to check the logs for any error messages. 4. If you're running Ory Hydra behind an API gateway or load balancer, ensure that it's configured correctly to pass requests to Hydra. As mentioned in the [Ory Hydra production guide](https://www.ory.sh/docs/hydra/self-hosted/production), it's recommended to run Hydra behind an API gateway. 5. Check if there are any network policies or firewalls blocking the traffic. If you're still encountering issues, you might want to examine the Ory Hydra logs for more detailed error messages. The 400 status code suggests a bad request, which is unusual for a health check endpoint. If the problem persists, you may want to consider opening an issue on the [Ory Hydra GitHub repository](https://github.com/ory/hydra) with more details about your setup and the exact error you're seeing.