We're running Sitecore in a multi-site configuration and currently have custom 404 pages for each of our sites.
What we would also like is to have custom 500 pages for each site. I haven't found much on how that works (if it does) in Sitecore, and was hoping the community had some insight into how to set up custom 500 pages in a multi-site Sitecore setup. Currently, we have one 500 page the two sites share. This is fine in development, but in production we don't want to expose the fact that these sites share the same box.
A 500 error is a server error so Sitecore can't process it. It should be a generic flat HTML file configured is IIS or the web.config