I built solution, created application in IIS and mapped it to the application folder. It works fine. Then I go to "Attach to Process", there are two w3wp.exe processes in list, but for one of them I get error "Unable to attach the process. A debugger is already attach." I've googled it but I can't find solution for my problem.
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Debug Diagnostic Tool v2 Update 2
https://www.microsoft.com/en-us/download/details.aspx?id=49924
Can use this link if the link provided by @mtkachenko above doesn't work
Really odd - but this simple thing works for me:
Go to some file in your main project.
Go to Project menu and choose Set as start-up project.
This might seem redundant if you've already chosen that project as the start-up project before, but it seems to work.
I have installed Debug Diagnostic Tool v2.0 and as a result I have Debug Diagnostic Service which is started automatically and attached to one of w3wp processes. After turning off and disabling this service all works fine. So if you get such error check processes in task manager which can capture your w3wp process.
You have 2 instance of VS and two entries in IIS running on the same application pool, for instance Both Server and Intranet are running on the same application pool.
=> Solution open IIS :
° Select the site and click 'Basic Settings' : Here you can check/select the application pool used.
° Click on the "Application Pools" node (right under your computer name) => You get a list of defined application pools.
° Right click under the last one defined to open the context menu and select 'Add Application Pool...' Create a new name and give it the same parameters that the one that was used by your site.
° Select the 'Basic Settings' of one of your sites and change its application pool to the new one just created. => Now Server and intranet have different application pools and your can debug the both at the same time.
Hope this helps.