I have a problem with the function of domaincheker WHMCS, each time a client verifies the availability of a domain name, he receives the following error:
There was an error in your request, the site WHMCS gives explicaion following for this error:
In csf, port 43 is open (TCP_OUT), do you think the firewall asl blocks this port ?When checking availability this domain has Indicates That Your firewall is blocking the whois port; 43. Please Ensure port 43 is open. It Could aussi indicato your server is Unable to connect to the whois server listed in the / includes / whoisservers.php file - Ensure your server is ble to connect to the whois server on port 43 for the TLDs listed in this file.
Thank you for your help