Error occured while consuming Crowd REST service

We are using the Atlassian Crowd server for authentication. and receiving the following error.

2014.02.28 11:21:34 org.jivesoftware.openfire.crowd.CrowdManager - Error occured while consuming Crowd REST service Read timed out

How should I begin troubleshooting this?

It doesnt happen on every request but several hundred times an hour.

We are also experienceing clustering issues where the cluster does not get a timely response.

Now I should clarifiy our environment.

we upgraded from 3.8.2 to 3.9.1

it is running on a 64bit Red Hat 6.5

In the /etc/sysconfig/openfire we point to a /usr/java/latest which is

java version “1.7.0_45”

Java™ SE Runtime Environment (build 1.7.0_45-b18)

Java HotSpot™ 64-Bit Server VM (build 24.45-b08, mixed mode)

Turned out to be an NTP thing between the crowd server and the AD farm.