Repairing Teredo is Unable to Qualify (Solved)
Teredo is a network protocol used to establish secure communication between clients and servers and to facilitate connection between devices behind routers that use network address translation (NAT). If this protocol is disabled or blocked, manually or by software, it can have these harmful effects on the system.
Users have reported that when using Teredo, there is a problem that leads to disconnection. The error message is that Teredo is not eligible. This error occurs when you try to connect to a multiplayer game or have a group chat, a pop-up window appears on the screen. This happens if you have a problem with the Teredo adapter or if you have disabled the firewall settings. The error may also occur if you have installed a third-party application that interferes with your connection to Teredo. This only applies in the case of a live chat with your teammates in play.