You have two options:
First, you can turn off custom errors in your web config. This is the quick-and-dirty approach but it will at least get you the information you are looking for. Just be sure to turn custom errors back on when you are done. NOTE: This method will display your stacktrace to the entire world.
<customErrors mode="Off" />
Second, you can remote desktop into your deployed machine, go to IIS Manager, and Browse to your site. Once you are there, reproduce the error and you will get the yellow screen of death you are looking for. For this to work, you will have to Enable Detailed Errors