**Describe the bug** The pulsar broker admin HTTP server does not starts because of an invalide RSA private key, see screenshoot. **To Reproduce** Enable TLS with a ECDSA certificate **Expected behavior** Should work with TLS **Screenshots** <img width="1792" alt="Screenshot 2022-03-22 at 14 08 54" src="https://user-images.githubusercontent.com/10274713/159926806-45c5c5b5-7c6c-4e22-a591-92234c92ae4a.png">