Cannot establish TCP connection to ws service by proxy

What happened:

My web domain is
Backend ip is This backend has 80 port for web page, and 6800 port for websocket service.
I enabled proxy for this domain in DNS configuration on Cloudflare.


# Just cannot establish TCP connection by domain
telnet 6800

# Direct connection is ok. I think there is something wrong with the Cloudflare proxy.
telnet 6800
Connected to
Escape character is '^]'.

telnet> quit
Connection closed.

That port is not supported by Cloudflare. You will need to change to one which is. Please use the search for further details.

1 Like

thank you. problem solved