From the TPS
Enter sms unmanage (if unit is managed)
Enter "edit" to enter configuration mode
Enter "gen" to enter general setting mode
Enter http enable/disable to toggle the service
Enter https enable/disable to toggle the service
Enter "commit" to commit the changes
Enter sms manage (if unit needs to be re-managed)
This should reset the HTTP/S service and allow the customer to log on through the browser once again.