Redirect issue after Login and Logout

I am trying to change the login and logout redirect page in admin panel.But it is not getting change.After saving also it is showing the old page.
The admin panel is showing the below note “Note: In rare few cases, server side caching may interfere with Redirections. Try disabling the server cache for your login page. This can be done by submitting a request to your server support team. You can also contact our support team here. ”
Please help me with the issue