By default, the InMotion Hosting reseller hosting servers do not block critical ports that you will need for proper functioning of WHMCS. However, if you’re in a reseller VPS it’s possible to open and close ports as you require. This is where you or an IT person may have the ability to block certain ports and cause errors in WHMCS. If you encounter this issue, use the support link above to get in touch with live experts who can help you get the error resolved.