Network communications Problem

Solution Verified - Updated -

Issue

  • Since midnight last night, we have not been able to access our server's VIA hostname, but we CAN access them via IP address.
  • Immediately we thought that there was a DNS problem, but DNS is working fine, and the servers are all resolvable.
  • /etc/resolve.conf and /etc/hosts all appear to be correct as well. 

Environment

  • Red Hat Enterprise Linux 5.5

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