WHMCS Tags troubleshooting-article Troubleshoot and resolve issues with DirectAdmin sending piped email replies twice. Troubleshoot and resolve The system blocked a potential email loop. (WHMCS 8.4 and later) or Blocked Potential Email Loop (WHMCS 8.3 and earlier) errors. Troubleshoot and resolve issues with Enom Portal type is not allowed errors while using the eNom New TLDs addon module. Troubleshoot and resolve issues with User not permitted errors while using the eNom New TLDs addon module. Troubleshoot and resolve Entity reference not found errors while transferring a domain using CentralNic Reseller. Troubleshoot and resolve issues with free domains appearing at full price. Troubleshoot and resolve Invalid Key errors while using the Software Licensing addon.