diff --git src/main/docbkx/troubleshooting.xml src/main/docbkx/troubleshooting.xml
index 3d480d3..e3cfb1a 100644
--- src/main/docbkx/troubleshooting.xml
+++ src/main/docbkx/troubleshooting.xml
@@ -1111,6 +1111,23 @@ ERROR org.apache.hadoop.hbase.regionserver.HRegionServer: ZooKeeper session expi
+
+ Snapshot Errors Due to Reverse DNS
+ Several operations within HBase, including snapshots, rely on properly configured
+ reverse DNS. Some environments, such as Amazon EC2, have trouble with reverse DNS. If you
+ see errors like the following on your RegionServers, check your reverse DNS configuration:
+
+2013-05-01 00:04:56,356 DEBUG org.apache.hadoop.hbase.procedure.Subprocedure: Subprocedure 'backup1'
+coordinator notified of 'acquire', waiting on 'reached' or 'abort' from coordinator.
+
+ In general, the hostname reported by the RegionServer needs to be the same as the
+ hostname the Master is trying to reach. You can see a hostname mismatch by looking for the
+ following type of message in the RegionServer's logs at start-up.
+
+2013-05-01 00:03:00,614 INFO org.apache.hadoop.hbase.regionserver.HRegionServer: Master passed us hostname
+to use. Was=myhost-1234, Now=ip-10-55-88-99.ec2.internal
+
+