I added a site to cloudflare. This site got 6 subdomains, out of which 5 are hosted at same server as that of the main domain, but a single subdomain is hosted at other server
So for that subdomain, I added an A record pointing to the IP address of that particular server.
Now my main domain and other 5 subdomains are working, but this subdomain which is hosted at some other server is not working.
Cloudflare is returning Error 521, Web server is down while the server is working fine (I have checked properly with both Telnet command. If I pause cloudflare, sub domains starts working well.
Any help regarding same will be appreciated.