Unable to log into the Enforce console, the browser tab just spins

Products

• Data Loss Prevention Core Package
• Data Loss Prevention
• Data Loss Prevention Enforce

Issue/Introduction

No console users are able to log into the Enforce console.
This happens on any browser.
Clearing the browser cache does not help.

The localhost log contains many of these entries:

Level: SEVERE
Source: org.apache.ojb.broker.accesslayer.JdbcAccessImpl
Message: PersistenceBrokerException during the execution of the query: Used ConnectionManager instance could not obtain a connection
Cause:
org.apache.ojb.broker.PersistenceBrokerException: Used ConnectionManager instance could not obtain a connectionorg.apache.ojb.broker.PersistenceBrokerException: Used ConnectionManager instance could not obtain a connection
Caused by: org.apache.ojb.broker.accesslayer.LookupException: Could not get connection from DBCP DataSource
Caused by: java.sql.SQLRecoverableException: IO Error: The Network Adapter could not establish the connection
Caused by: java.io.IOException: Connection refused: connect, socket connect lapse 1015 ms. /<IP Address> 1525 0 1 true
Caused by: java.net.ConnectException: Connection refused: connect 
org.apache.ojb.broker.accesslayer.LookupException: Could not get connection from DBCP DataSourceorg.apache.ojb.broker.accesslayer.LookupException: Could not get connection from DBCP DataSource
java.sql.SQLRecoverableException: IO Error: The Network Adapter could not establish the connectionjava.sql.SQLRecoverableException: IO Error: The Network Adapter could not establish the connection
Caused by: oracle.net.ns.NetException: The Network Adapter could not establish the connection

And:
Level: INFO
Source: com.vontu.manager.systemevent.UserLockoutEventHandler
Message: Unknown exception while processing user lockout event
Cause:
com.vontu.model.DatabaseConnectionException: org.apache.ojb.broker.PersistenceBrokerException: Used ConnectionManager instance could not obtain a connectioncom.vontu.model.DatabaseConnectionException: org.apache.ojb.broker.PersistenceBrokerException: Used ConnectionManager instance could not obtain a connection

Cause

During a database server patching the DLP Oracle account was locked.

Resolution

The DBA released the lock on the DLP Oracle account and the Enforce console now loads.