After upgrading to Security Analytics 8.3.1, a sensor with a proxy server configured will see the message
The system was recently upgraded to version 8.3.1, and a proxy server has been configured.
A Security Analytics module connecting to a database on the sensor uses the sa-manager hostname to connect. If there is a proxy server configured, the module attempts to connect through the proxy server, and any connections are rejected.
The fix is simple but requires a reboot. There is no impact to the current configuration of the system. Packets are still being captured and indexed.