We have a 440 ADC load balancer, running HTTP and HTTPS services with content caching enabled. We enabled content caching about 8 months ago, and the cache efficiency usually hovered around 30%-50%. However, after upgrading the unit's firmware to version 6.0.0.005 a few weeks ago, the cache efficiency has not risen above 3%.
I had not made any changes to the cache settings. I checked with our web developers, and they had not made any changes to content headers, etc., which would have affected caching. I did tweak the cache settings later, but it made no difference.
Has anyone else seen this, or does anyone have any ideas about how to fix it?