VPN error: All keys are blank

When you view the properties of a manual connection, all preshared keys and the algorithm keys for the connection are blank.

Symptom:
All preshared keys and the algorithm keys for manual connections are blank.
Possible resolution:
This happens whenever the system value QRETSVRSEC is set back to 0. Setting this system value to 0 erases all of the keys in the VPN policy database. To fix this problem, you must set the system value to 1 and then reenter all of the keys. Refer to Error message: Unable to encrypt keys for more information about how to do this.
Related concepts
VPN error message: Unable to encrypt key...