Cannot see "runtime" in Konnect Runtimes Manager

Hello, I followed the " Quick Setup - Docker", just ran the runtime in my on-prem docker engine, but cannot see runtime in Rutime Manager. And in the container log, it said “[lua] init.lua:433: connection to control plane ,xxxxxxx… broken: failed to connect: timeout retrying after 6 seconds, context: ngx.timer”

By the way, we have proxy under the hood, and already configured for docker.engine.
Any idea for this problem? Very appreciated. Tks.