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ASP.NET Development Server always needed a restart


I work in VS 2008, and every time I made a change to my code / html I had to stop the ASP.NET development server – apparently called Cassini.

This was a little irritating as you can imagine, after scouring the internet every time I had a chance for a few months, I was ready to give up, I even posted on a few forums.

Then I found a great site that spoke about nothing to do with the server, and guess what it is working. It has to do with how .net is dealt with on you machine, and it obviously assumes you are not a coder by default.

The Fix

On the MSDN forums I found a reference to the Microsoft knowledge base: KB911272. In summary

Essentially the HKLM\Software\Microsoft\ASP.NET\FCNMode determines how ASP.NET is dealt with as an app on the box.

Initially setting this to "0" fixed the problem, but this caused a UNC share problem, so then I set it to two after finding this great item


And now I can change my code and run on the fly.


Jason said…
I'm having this exact same problem with VS2008. I just recently installed VS2010 and continue to have it, unbelievable! I've tried this FCNMode setting at 0 and 2, neither make a difference. This is such an incredibly frustrating problem -- can you think of anything that could help me? I'm running .NET 2.0.50727.4927 and 4.0.30319.1 on Win7 64-bit.

I'm starting to think the 64-bit is the problem, but I can't be the only one in the world with VS2008/2010 on Win7 64bit. Ugh!

Thanks for letting me vent.
Wassa said…
You have to do a reboot between, have had the problem a number of times since this post and it has worked every time. Otherwise the ASP.NET forums have been remarkably helpful for me. Thanks for taking the tim eto comment

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