The DEWEY Exchange 2007 server stopped answering OWA requests around 2:30 PM Eastern. We’ve tried to restart the service which bought no change. Unfortunately we will have to reboot the server to bring Exchange services back online. The server is expected to be online by 3PM Eastern.
Update 3:30 PM: The server has been online for the past twenty minutes, but we noticed an extremely large amount of traffic going from DEWEY. Upon investigation, it looks like DEWEY was encountering issues delivering RPC packets to a client who has a misconfigured router as the packets are going back to DEWEY and creating an infinite loop. We’ve disabled traffic to that host and will continue to monitor this over the next 24 hours.