My web domain is files.oracle.silentred.club
Backend ip is 126.96.36.199. 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 files.oracle.silentred.club 6800 Trying 188.8.131.52... ^C # Direct connection is ok. I think there is something wrong with the Cloudflare proxy. telnet 184.108.40.206 6800 Trying 220.127.116.11... Connected to 18.104.22.168. Escape character is '^]'. ^]quit telnet> quit Connection closed.