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For security reasons we wanted to chnage the service accounts username for all the IIS application pools and SharePoint service , so we created a new user named "Staging.user", and i define it as a managed account inside SharePoint. and then we chnage the iis application pool and the SharePoint services to use this account, as follow:-

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but after that some site collections will raise an 403 Forbidden error when trying to access them, while other will work. For example we have a list where all the views will work but the create form will raise 403 HTTP error , so we can edit the list items and delete them, but if we click on create form we will get 403 forbidden error.. so can anyone adivce what is causing this ? Thanks

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    did you change the app pool account and services account from Central admin? did you peform IIS reset on servers? also did you clear the config cache – Waqas Sarwar MVP Oct 18 '14 at 0:19
  • @WaqasSarwarMCSE what do u mean by changing the app pool account on central admin ? and yes i restart the server and cleared the cach – john Gu Oct 18 '14 at 0:32
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    From central admin > Security > Configure Service Accounts – Waqas Sarwar MVP Oct 18 '14 at 0:35
  • aha ok i will update them now,, but meanwhile why some site collections are working well, while other will return 403 ? is there a reason behind this ? – john Gu Oct 18 '14 at 0:41
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    any clue in ULS logs when you get the 403 error...on which page it is getting? – Waqas Sarwar MVP Oct 18 '14 at 0:56
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Looks like you change the AppPool from IIS. It is highly recommended to update / Change the app Pool Account from SharePoint(central Admin / powershell).

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