WHMCS Tags troubleshooting-article Troubleshoot and resolve Smarty Error: Not allowed by security policy errors. Troubleshoot and resolve Could Not Authenticate errors. Troubleshoot and resolve Could not connect to SMTP host errors. Troubleshoot and resolve SMTP ERROR: Password command failed errors while attempting to use basic SMTP authentication with Microsoft®. Troubleshoot and resolve Social login: Error We could not connect to your account errors while authenticating using Facebook®, Google®, or Twitter™ Sign-In Integrations. Troubleshooting and resolving problems while provisioning MarketConnect SSL certificates. How to troubleshoot and resolve display issues in Server Status Monitoring.