How to debug CrashDump of ASP.NET 4.5 - symbols mismatch / missing?

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Having sporadic w3wp.exe crashes on productive system

Neither way of debugging the CrashDump using WinDbg or VisualStudio2012 was successful

VS2012: Debugging information for w3wp.exe cannot be found or does not match.
No symbols loaded for System.Web.ni.dll - No matching binary found.
OurOwnCustom.dll: No matching binary found

WinDbg: PSSCOR4 not supporting .NET 4.5
StackTraces not showing managed server code at all

How should we debug ASP.NET 4.5 CrashDumps successfully?

Or is this currently not possible due to missing public symbols for .NET 4.5?

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