The connection to the back-end database was restored shortly after the error occurred. We found this error in the Kernel Application logs:
java.rmi.ConnectIOException: Exception creating connection to: 10.0.1.90; nested exception is:
java.net.SocketException: No buffer space available (maximum connections reached?): connect
This indicates the Adeptia Kernel was unable to create the necessary connections to the back-end database.
Increase the following property within the server-configure.properties file.
<Property comment="The maximum number of active connections that can be allocated from this pool at the same time, or non-positive for no limit." dynamic="no" name="abpm.jdo.maxActive">50</Property>
To find more information regarding these properties, you can refer to this forum post: http://support.adeptia.com/entries/21597287-Database-connection-properties.