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I’m not sure how you got sucked into reading this post, but since you’re here I might as well tell you how to make your Exchange 2013 Mailbox role deployment highly available by using a Database Availability Group and I’m going to shorten that to DAG because it’s a nightmare to type. Before we get too deep into it, let’s first make sure you’re on the right plane.
This flight will take you through configuring a DAG in Exchange 2013 with two nodes in the same site to make your Mailbox role highly available.
Do global domain searches, look up internic whois records, and query the arin database with our automatic whois lookup.They should be behind a firewall on the trusted side of your LAN.If you do expose them to the Internet, having a made-up TLD isn't going to help you much.Check your network path with our simple visual traceroute.Use our icmp ping and traceroute to check your servers.