NAV2015 Web Client side-by-side with 2013R2 Web Client

I had some serious issues with getting the 2015 Web client working on my dev machine where I also have 2013R2 Web client installed. The Application Pool kept stopping and error 503 was thrown.

The solution was to change the identity on the Application Pool for the 2015 Web client from ApplicationPoolIdentity to NetworkService. After a restart of the Application Pool the 2015 Web client started working.

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