Windows update fails when isatap enabled

Question

Hi there,
I'm using windows 8.1 pro x64 and encounter one problem.
My desktop has only one ethernet adapter, and I've disabled its ipv6 protocol. Insteadly, I use isatap tunnel to access ipv6 network.
The problem is that, if the isatap tunnel works, windows update will try to fetch updates via ipv6 and fail; while if I diable the isatap tunnel, windows update will work fine.
I wonder how to force windows update to use ipv4 access while isatap tunnel enabled.
Thanks!

Answer 1

Hi,
We cannot force Windows update to use ipv4 or ipv6.
In default Windows prefix policy,IPv6 addresses are preferred over IPv4 addresses.
I suggest we add a prefix policy to prefer IPv4 addresses over IPv6 to test it.
Please follow the steps:
1.Press Win+R, type regedit, and press enter.
2.In Registry Editor,locate and then click the following registry subkey:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip6\Parameters \
3.Double-click DisabledComponents to change the DisabledComponents entry.
Note  If the DisabledComponents entry is unavailable, you must create it.
To do this, follow these steps:
a.In the Edit menu, point to New, and then click DWORD (32-bit) Value.
b.Type DisabledComponents, and then press ENTER.
c.Double-click DisabledComponents.
4.Type 0x20  to prefer IPv4 over IPv6 by changing entries in the prefix policy table.
Regards,
Kelvin hsu
TechNet Community Support