I always love to use beta software, and with that comes the occasional, “oh great, what just happened?” moment.
I repaved my main machine last week, and really loving how Visual Studio 11 is shaping up, only installed that. Yesterday, I decided I needed to install Visual Studio 2010, did that, then ran the Web Platform Installer from www.asp.net/downloads to update the installation. This included IIS 7.5 Express.
The process went fine, until today, when I started working and none of my MVC 3/4 sites would work, even small “delme” projects. The browser would show a 500 Internal Server Error, with no other messages. Bingling, for IIS 8.0 Express, I ran across this page, http://learn.iis.net/page.aspx/1286/iis-80-express-readme/#KnownIssues, which states that “Side-by-side installations of IIS 8.0 Express and IIS 7.5 Express are not supported.” It goes on to say that the IIS 7.5 Express installer doesn’t check to see if IIS 8.0 Express is installed, so, there is the rub.
Fortunately the article goes on to talk about how to fix the issue.
1. Open Control Panel –> Programs and Features
2. Uninstall IIS 7.5 Express
3. Right click IIS 8.0 Express and click “Repair”
4. Open Registry Editor and delete the following key:
I did all that, and my pages are working again. All better now.