1213486160 has a friend: 1195725856
Previously, Go's TLS library will report "tls oversized record received with length 20527" when the remote address was not actually handling TLS connections. The magic number is simply because <a href="https://github.com/golang/go/issues/11111" rel="nofollow">https://github.com/golang/go/issues/11111</a>. Even better, when you google that error, you get all docker-related issues. Poor docker.