We are investigating the Dallas outage now.
Confirmed to be an INAP hardware issue. INAP has opened a ticket with their vendor.
As of a few minutes after the event, connectivity appears to be restored.
From MTRs provided and our own, it appears that something at INAP failed and then failed over. We've ticketed them for more information.
If you continue to be seeing a connectivity issue to a Dallas server, please send in a short-cycle MTR for review.