Restrict Browser Back button

history.pushState(null, null, location.href);
    window.onpopstate = function () {
        history.go(1);
    };

Use the above code to restrict going to the back page from the current page.

This piece of code comes very handy when you are working on dynamics portals and you have logic where you should not allow users to navigate to back page.

Dynamics Portals Caching issue

When you change any portal configuration in CRM it doesn't gets reflected on the portals unless the portal is restated from the admin portal. This is very painful when we tend to do some small changes as it takes at least 2-3 mins to restart the portal.

Portal provides about page which has the clear cache option which can be used in this senarions. to access the page append the Portal URL + /_services/about

Make sure the user accessing this page is logged into the portal and have "administrator" web role