I'm having problem in our extjs php application. We have two server and there is a load balancing (NLB) in there working in a round robin way . While using the system the user is having some problems like data is not loading from the database and also the http requests are being aborted. I don't know actually from where we will start our troubleshooting.
On any particular page in the website, when you opened a page, a number of the assets (user info, dropdown, the whole page also etc) failed to load. If you refreshed, the page may work fine, the same set of assets may fail to load or different assets may fail to load.
There was nothing in any of the apache logs about the requests that failed, however since it seemed to point to an apache issue, we restarted apache. The first time we tried, it made no difference but about 10 minutes later, in the absence of a better solution we tried again. Bizarrely, the problem disappeared immediately. And again come after 1-2 days.
I have also made the process php to multiple, so that different request get different php file but looks like the issue is not there.