CODEWITHSUNDEEP
asp.netvisual-studioiis-express
KrijnAtLive
KrijnAtLive

Reputation: 1

IIS Express only runs .NET 3.5 websites

I cannot run/debug ASP.NET .NET >= 4.0 applications through IIS Express: Access denied. When I switch to .NET 3.5 everything runs fine. Could this be because the .NET 3.5 installation was executed after .NET 4.xx? Checked both the applicationhost.configs under .vs\configuration and in %user%\documents folder; no strange setup here (= default settings). I've reïnstalled iisexpress => no success. Created a new local admin user => no success.

No usefull information is logged under documents\iisexpress\tracelogfiles. When debugging and breaking all Gac assemblies are loaded but the project dll is not. I've always tested with a new, clean asp.net empty web application.

Note: I do have 'Microsoft .NET Core Tools (Preview 2)' installed. Could this be the problem?

Upvotes: 0

Views: 110

Answers (1)

Richard Squires
Richard Squires

Reputation: 81

I had a similar issue where after upgrading a legacy app to .Net Framework 4.x IIS Express was running under .Net Framework 3.5, which caused similar issues. Actually looking for an alternate solution for the below, however here is the fix I've used for IIS express not running dot net framework 4:

In your web.config find system.web section and for property httpRuntime set the targetFarmework to 4.x.x (replace x with your specific .Net Framework version).

Upvotes: 0

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