Our Exchange 2013 servers stopped working when version 729 was downloaded and applied last night. In the Windows event logs, the Exchange servers were complaining about problems with the Exchange topology and not being able to find a valid domain controller, Event IDs, 2130 2142 2070. We did have LDAP communication from the Exchange servers to the DC being allowed through our PA 3050s, but most flows were very small, ~464 bytes. I reverted to version 727 and almost immediately the Exchange servers restarted their services and started servicing email.
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