Use Confirmation Page

Recently I came across a weird issue, one of the user raised an incident that he can't see the use-confirmation page and he is getting access denied error in-spite of having administrative rights on the site.

I checked myself and confirmd that he was one of a site collection admin, when I myself tried to access that page, I was getting SQL error, that page doesn't exist.

I searched a lot and found some solution, below are the steps:

Use Confirmation page URL : http://sitename/_layouts/useconfirmation.aspx

Description: This page is used to confirm that this site is in use,
Issue type: If anytime you get access denied error that means, this site has read only access or might get locked

Solution:

• Go to --> central admin--> application management---> 

• under site collection--> configure quotas & lock

• select the desirable site---> and check "lock status for this site" should be selected as "Not locked"

And that's it, it  should work.