To add, a 408 and 407 means that you've configured both NAT and have DNS on the server. This is a known issue:
Events 407 and 408 Are Reported in the DNS Server Event Log
http://support.microsoft.com/kb/279678
Event ID 408
https://www.eventid.net/display-eventid-408-source-DNS-eventno-778-phase-1.htm
Event ID 408 — DNS Server Configuration
http://technet.microsoft.com/en-us/library/cc735852(v=WS.10).aspx
Event ID 404 — DNS Server Service Status
http://technet.microsoft.com/en-us/library/cc774605(v=WS.10).aspx
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There are more links, but the basis is the errors are coming up due to misconfig, incompatible components configured/installed on one box, or routing design.
Ace Fekay
MVP, MCT, MCSE 2012, MCITP EA & MCTS Windows 2008/R2, Exchange 2013, 2010 EA & 2007, MCSE & MCSA 2003/2000, MCSA Messaging 2003
Microsoft Certified Trainer
Microsoft MVP - Directory Services
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