published reports don't work - Database logon failed Error

Question

I am developing a simple web app that has 3 reports created on VS 2013, for some reason those reports run fine from developer mode, but when I publish the website they give

Answer 1

In my case the problem was that on IIS Application Pools/ my web app/ Advanced Settings the 32 bit Applications was disable and I wasn't including on my project the folder aspnet_client where crystal run-times files are storage, so the time I was publishing the app, those files wren't transferred. Once I enabled the connection and included that folder the issue got resolved.