This morning I logged on to see a bunch of emails saying the Web Viewer was down.
Users saw the 'Can't reach the page' error.
I logged onto the linux server and issued ps command and it appeared the viewer was active. I shutdown tomcat, restarted tomcat and that resolved the issue.
Release : 12.1
Component : CA OUTPUT MANAGEMENT WEB VIEWER FOR ALL PLATFORMS
There were definite CCI connection (pipe broken) errors in the Catalina log. There was apparently a network problem that could not be resolved until Tomcat was recycled.