API keys https endpoint refuses connection about testnets HOT 2 CLOSED

$ nslookup klaytn.testnet.blockpi.net | grep Addr 
Address: 35.215.179.207
Address: 139.99.72.111
Address: 172.104.67.151

$ for a in 35.215.179.207 139.99.72.111 172.104.67.151; do nc -zv -w2 $a 80; nc -zv -w2 $a 443; done
Connection to 35.215.179.207 80 port [tcp/http] succeeded!
nc: connect to 35.215.179.207 port 443 (tcp) timed out: Operation now in progress
Connection to 139.99.72.111 80 port [tcp/http] succeeded!
Connection to 139.99.72.111 443 port [tcp/https] succeeded!
Connection to 172.104.67.151 80 port [tcp/http] succeeded!
Connection to 172.104.67.151 443 port [tcp/https] succeeded!

$ nslookup klaytn.testnet.blockpi.net | grep Addr
Address: 167.235.234.39

$ nc -zv 167.235.234.39 443
nc: connect to 167.235.234.39 port 443 (tcp) failed: Connection refused
$ nc -zv 167.235.234.39 80
Connection to 167.235.234.39 80 port [tcp/http] succeeded!

$ nslookup klaytn.testnet.blockpi.net | grep Addr
Address:	213.186.33.99#53
Address: 5.161.122.58

$ nc -zv 5.161.122.58 443
Connection to 5.161.122.58 443 port [tcp/https] succeeded!
$ nc -zv 5.161.122.58 80
Connection to 5.161.122.58 80 port [tcp/http] succeeded!