VNC through Cloudflare

I’m using CF so far quite successful and really like it.
However, now I want to make a Docker container available via VNC. I opened the exposed port in my Fritzbox and have a CNAME record sample.domain.com pointing to my domain.com pointing to my IP. (The container is not sitting behind a reverse proxy)

When I open a VNC connection to localhost:5900 it works really good, but when I say record.domain.com:5900 nothing connects.

How can I forward the VNC request to my router, so it gets to the container?

VNC uses neither supported port nor a supported protocol. You need to unproxy record.domain.com
You could try Guacamole, which will work. But with the risk to get banned from Cloudflare.

https://support.cloudflare.com/hc/en-us/articles/200169156-Identifying-network-ports-compatible-with-Cloudflare-s-proxy

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