Validation problems for some vv YubiKey prefixes

We are experiencing network problems that cause a fraction of the keys uploaded to our AES Key Upload service to fail validation against our YubiCloud validation server. We have reported the issue to our network provider, and will update this post with more information as we receive it.

Update: The problem has been resolved now, it was a router misconfiguration at the network provider that caused the problem.

Update: We have received reports that some non-vv keys may have been affected and we are investigating why that may be.

Update: Further investigation indicates that about 50 distinct YubiKeys were affected by this incident.