Symptoms

When trying to access K2 Designer IIS showed the following error in the browser:

When trying to access K2 Designer IIS showed the following error in the browser:

HTTP Error 500.19 - Internal Server

Error Code
0x80070021

Config Error

This configuration section cannot be used at this path. This happens when the section is locked at the parent level. Locking is either by default (overrideMode="Deny"), or set explicitly by a location tag with overrideMode="Deny" or the legacy allowOverride="false'

Error Code
0x80070021

Config Error

This configuration section cannot be used at this path. This happens when the section is locked at the parent level. Locking is either by default (overrideMode="Deny"), or set explicitly by a location tag with overrideMode="Deny" or the legacy allowOverride="false'

Config Source


 

Diagnoses

After investigation it was determined (through trial and error in a VM) that the handler tags were locked in the applicationhost.config file. That file can be found under the path: :DRIVE]:/Windows/System32/inetsrv/config
 

Resolution

1) Run the command line as an administrator

2) Navigate it to %windir%system32inetsrv

3) Run the following: appcmd.exe unlock config "K2/Designer" -section:handlers -commitpath:apphost

That will unlock the section handlers.
http://forums.iis.net/t/1155232.aspx?HTTP Error 500 19 Internal Server Error 0x80070021 Lock Violation with OWA Exchange 2007