Admins diary

When I try and open AD Users and Computers MMC I get this error:
"The directory schema is not accesible because:
An invalid directory pathname was passed
For this reason the Neww menu may be inaccurate and extension snap-ins may not work properly".

When I click the ok button I get this next message:
"Data from Active Directory Users and Computers
{domain.name.com} is not available from Domain Controller domain.name.com because:
The server is not operational.
Try again later or choose another DC by selecting Connect to Domain Controller on teh Domain context menu".

Dcdiag shows no result.

After hours of searching and nothing usable.

All I had to do was turn IPv6 back on. Previously disabled.

So simple :)