Dev License: This installation of WHMCS is running under a Development License and is not authorized to be used for production use. Please report any cases of abuse to abuse@whmcs.com
To enhance the security, we’ve configured FTP over SSL and removed plain text authentication in our Windows Server 2016 Shared hosting. So, if you are connecting first time through FTP, it will ask you to allow certificate like below.

certificate popup

Check the option “Always trust certificate in future sessions†and click on OK button. This will encrypt all your FTP connections.
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