Last week I had to stress a web portal running on x64 machine. Everything works as spected but when I tried to analyze ASP.Net counters I found there was little problem, every ASP.Net related counter was empty, I mean with no values.

And this is because my loadagent was running in 32-bit machine.

I've found but it's too late to try it :-(

This experience makes me think ... ¿Do we really need 64bit for application servers (IIS)?