Docker attempts to push image to the wrong URL

I have a Docker Distribution instance set up for deploying Docker images. I’m using TLS with certificate authentication to restrict access. When I try to push an image to that repository, located at docker.mydomain.com:8443, the Docker daemon appears to connect to the repository successfully. However, it then attempts to push the image to a URL like http://docker.mydomain.com:443/...

Have I configured something incorrectly or am I encountering a bug? Relevant log file: http://pastebin.com/BYzs1fHb