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I need to change application pool account for SP 2016 web application from farm account to service account, i did the same steps here

https://blogs.msdn.microsoft.com/denotation/2014/02/27/how-to-change-sharepoint-2013-application-pool-account/

the web application isn't browsed with 500 internal error !!!!!!!!!

Am i missing any permission?

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Before changing the account ( following the blog) you have to make sure couple of things.

  • New service account should have Database Permission SPdataAccess role on the Content Database and Config database. You have to manually set this on the database Server.
  • Also make Sure new service account is part of IIS_IUSRS group on the server.It is local group...go to computer management > Local User and Groups.
  • Reset IIS after changing the App Pool account ( after following Blog steps).

If stil throwing the error, check the event log on the server to get more error information.

  • thank you , only SPdataAccess , no owner ?! – Aashirya Apr 28 '17 at 12:48
  • if SPdataacess did not work then you can make it DBowner – Waqas Sarwar MVP Apr 28 '17 at 12:49
  • no avail, event log An exception occurred when trying to establish endpoint for context: Could not load file or assembly 'Microsoft.IdentityModel.Extensions, Version=2.0.0.0, Culture=neutral, PublicKeyToken=69c3241e6f0468ca' or one of its dependencies. Provider type not defined. (Exception from HRESULT: 0x80090017). task category Claims Authentication – Aashirya Apr 28 '17 at 12:57
  • so this is log on as batch right issue...check this to fix it social.technet.microsoft.com/wiki/contents/articles/… – Waqas Sarwar MVP Apr 28 '17 at 12:59
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    User needs to be in the local IIS WPG group to run an app pool. Check the event viewer. – Glenn Ferrie May 1 '17 at 0:49

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