How do you reproduce bugs that occur sporadically?

Question

We have a bug in our application that does not occur every time and therefore we don\'t know its \"logic\". I don\'t even get it reproduced in 100 times today.

Disclaime

Answer 1

For .NET projects You can use Elmah (Error Logging Modules and Handlers) to monitor you application for un-caught exceptions, it's very simple to install and provides a very nice interface to browse unknown errors

http://code.google.com/p/elmah/

This saved me just today in catching a very random error that was occuring during a registration process

Other than that I can only recommend trying to get as much information from your users as possible and having a thorough understanding of the project workflow

They mostly come out at night.... mostly