SQL Server SSPI handshake failed with error code 0x8009030c

Ran into this issue during a new SP 2010 install this week:

“SQL Server SSPI handshake failed with error code 0x8009030c”

Took awhile to figure out but I was able to solve it by making a Local Security Policy change on the SQL box:

Go to Local policies | User rights assignment | Access this computer from the network and add the account(s) that are trying to login to SQL.

Credit to link for the info.