If you get request time out error while checking whois, it reveals that your firewall is blocking port number 43. Please make sure that, this port is open. It could also indicate your server is unable to connect to the whois server listed in the /includes/whoisservers.php file - make your server is able to connect to the whois server on port 43 for the TLD listed in this file.
If your issue still persists, it is suggested to submit a support ticket with the exact error message along with appropriate screen capture, to get your issue resolved.
██ BestServerSupport | Outsourced Hosting Support and Server Management Service Provider
██ WHM/CPanel | HyperV Virtualization | Plesk | WebsitePanel | Windows VPS | OnAPP Cloud | Virtuzoo
██ Helpdesk Support | Cloud Administration | Dedicated Support | VPS Support