Getting 404 page some time

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I have installed concrete 5 8.1.0 in IIS 8.5. Enabled preety url. All the front end pages are working properly. But when I am logged in as admin the dashboard pages are showing 404 page sometimes and when I am trying to edit a page it sometimes shows me 404 error.

 
Babli replied on at Permalink Reply
Please help. Need to fix this.
ConcreteOwl replied on at Permalink Reply
ConcreteOwl
Probably a server back end cache problem.
Make sure you don't have a server cache such as 'varnish' or 'Cachewall' running in the back end.
Could also be a mod_security problem, if mod_security is enabled try disabling it.