This issue is due to the presence of Cisco bug ID CSCse99322.
Oracle listener saves its logs to the listener.log file. When this issue occurs, the listener stops once the file reaches the operating system limit of 2 GB. As a consequence, no new Oracle connections can be established, and the Cisco Security Monitoring, Analysis, and Response System (CS-MARS) loses some of its functionality.
For example, the webpage comes up without icons or banners. There is just a username and password prompt in the upper left hand corner and an error message in the browser.
Or, at times the device can be accessed through Secure Shell (SSH), but most of the commands produce errors. These are some of the commands that produce errors: