Just migrated to VS2005 now can't get VS2003 debugger to work


I just migrated my project from VS2003 to VS2005. Before I started I backed up my VS2003 solution.

I now need to go back to VS2003 for a while (my boss has something urgent he wants doing so don't have time to get it working and do proper testing because of the new CLR 2.0).

The problem is that I've restored my VS2003 solution and can't get the VS2003 debugger to start. It says: "Error while trying to run project: Unable to start debugging on the web server".

I've looked at the help file but I need to narrow it down a bit (I can't check all that stuff!):

Am I looking at a re-install of IIS and VS2003 ? (groan)

Any help REALLY appreciated.

Thanks in advance,


1/15/2007 10:52:24 PM
asp.net.migrate-vs2003-vs2005 590 articles. 0 followers. Follow

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If I remember correctly, installing ASP.NET 2.0 automatically upgrades all web sites on the machine to ASP.NET 2.0.  Check the application in IIS on the ASP.NET version tab and set it to run under ASP.NET v1.1

Darrell Norton, MVP
Darrell Norton's Blog

Please mark this post as answered if it helped you!
1/16/2007 2:50:09 AM

Your memory serves you correctly.

 All sorted and working.

BIG thanks Yes

1/16/2007 4:53:06 AM


The problem I've got now is that I've gone back to my CLR V2.0 solution and Visual Studio 2005 debugger won't start. I have changed the CLR version in the ASP.NET tab (within IIS) back to V 2

When I start VS2005 and start the debugger it partially updates the screen (as if it is going to show the debugger panels but it never redraws them). After 2 or 3 minutes the devenv.exe process is still using about 50% to 80% CPU usage and so I assume its crashed.

Any help greatly appreciated.


1/18/2007 5:16:45 AM

After hanging for about 5(?) minutes, while typing the above post VS2005 came back with the following error message:

"Cannot detach from one or more processes:

[4032] aspnet_wp.exe: The debugger is still attaching to the process.

Do you want to terminate them instead"

I then clicked "Yes" and it said:

"Unable to start debugging on the server. The operation has timed out.

Click Help for more information"

(except that there is no help button to click on) Tongue Tied

1/18/2007 5:27:03 AM

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