Why are cookies unrecognized when a link is clicked from an external source (i.e. Excel, Word, etc…)

Question

I noticed that when a link is clicked externally from the web browser, such as from Excel or Word, that my session cookie is initially unrecognized, even if the link opens u

Answer 1

I had to solve this issue for an ASP.NET site but I only wanted to use javascript/ jQuery:

var isCoBrowse = ('<%= Session["user"].ToString().ToLower() %>' != '0');
if (isCoBrowse && window.location.href.indexOf('ReturnUrl=') >= 0 && window.location.href.indexOf('dllCheq') == -1) {
    //redirect to the ReturnUrl & add dllCheq to the URI
    var toRedirect = decodeURIComponent(gup('ReturnUrl', window.location.href)) + '&dllCheq';
    window.location = toRedirect;
}

I got the gup function from: How to get the value from the URL parameter?