License installation fails with the following error:
PLESK_ERROR: cURL cannot communicate with license server https://ka.plesk.com:5224/xmlrpc (220.127.116.11): Empty reply from server(52) cURL cannot communicate with license server https://ka.plesk.com:5224/xmlrpc (): Could not resolve host: ka.plesk.com(6)
nslookup tool shows that ka.plesk.com is resolved on 18.104.22.168 gloabally:
# nslookup ka.plesk.com 22.214.171.124
Address: 126.96.36.199 <- this is the IP address that Google DNS shows for ka.plesk.com
nslookup cannot establish a connection to ka.plesk.com using server DNS settings:
# nslookup ka.plesk.com
DNS request timed out.
timeout was 2 seconds.
Network configuration is incorrect: a connection from Plesk server to ka.plesk.com cannot be established due to incorrect DNS resolution on a server or network level
Contact network administrator for setting the proper network as preferred for Internet connections.