Explain about the flow of self signed certificate?

What is WAS in WebSphere 6.0? What is the latest version of WAS? What was its last two versions?

What is a cell-config.xml file?

I am into a support team, and i am much interested in knowing the worst kind of problems that you have encountered till date, the problems/issues which were night mares to you.Let me start with my exp:We had encountered a problem like the site was performing slow, we had checked all the possible things but nothing did work. all the applications were working fine like the web servers, app servers, third...