ISSUE: Database Communication Link Failure (IMPORTANT)

Database communication link failures can occur if there are duplicate iptable rules.

The following exceptions in the Weblogic logs indicate a database communication issue: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure.

To correct the issue:

1. Have the network administrator review the iptable rules.
2. Remove duplicate or overlapping iptable rules.
3. Stop and restart STA:

   $ STA stop all
   $ STA start all