Hi , it's happen to me too when i check cloudflare is already listed to failban by (ModSecurity)
So what i did is to whitelist Cloudflare IP , Now i don't get error 521
Hello i run 5 wordpress website , can i use plesk on this configuration
Intel Xeon X3220
2.40GHz 8M Cache
8GB RAM
380 SSD
/29 IPv4 (5 Usable)
10 TB Monthly Transfer
100Mbps Network Port Speed
Los Angeles Location
Looking forward for your advice