Microsoft ISATAP 6to4 adapter

Issues

A yellow exclamation mark is found at the Microsoft ISATAP 6to4 adapter



Sometimes we lose the internet connection because of an error in Device Manager, a yellow exclamation point is found on "Microsoft ISATAP " and on"6to4

adapter".

According to Microsoft support, we can ignore this problem, the card will work properly. But the problem, is that in most cases, we lose our internet

connection.

Microsoft ISATAP

According to the Microsoft site:

Microsoft ISATAP device (inter automatic tunneling protocol address of the site) is used to help companies transition to an IPv6 infrastructure. ISATAP encapsulates IPv6 packets using IPv4 header. This feature allows the customer carry IPv6 traffic over an IPv4 infrastructure. This approach enables organizations slowly migrate to an IPv6 infrastructure without having to spend much time and financial resources to convert the new infrastructure.

Solution

• Open Device Manager (Start / Run or Windows Key + R, enter: devmgmt.msc).
• Right-click on Adapter 6to4.
• Choose "Uninstall".
• Then in the top menu, select "Action" / "add hardware, then" next ".
• Select "manually select from a list" /"network adapter (or network cards)" /"Microsoft"/"Microsoft 6to4 Adapter".
• Finally, select "finish installing new hardware".
• Restart the PC.

Normally, there should be no more problems in the device manager and the network connection is back.