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Strange/Weird/Baffling Internet Explorer 11 Compatibility Mode Issue with .NET Site

I just resolved a really strange issue with the way my application loads in Internet Explorer 11 when compatibility mode is not on.   It was pointed out by a user and causes behavior such as a "cryptic" string being appended to our site url's and some pages not loading but instead giving a "bad request (invalid url)" error.

Here's a sample of the URL when compatibility is not on:
http://berkley.gettango.com/(F(n8fH3A-2n5nHBGAGMczFOlVwzq5JjV0oC8tRGHiMIxlC_XbJPJZxbpbseaC-w5-Mwg24dU1ZtHXUOYN1SvYUIIql67r5is91kQAb3FPDE1Y20tXNCjALZmSEuAitqo2oSSVlbnX-WQPXd75Pt1c0FnZeEg1G7DhGjCUAErDGP8U1))/dashexec.aspx

and when it's on:
http://berkley.gettango.com/dashexec.aspx

Could anyone explain to me what is going on here?  And better yet,how to fix it so the site loads correctly in IE 11 w/o compatibility turned on.  As a side note, our site uses Telerik Controls.  Not sure if the two are related at all but when compatibility is off many of the controls won't load.
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cat4larry
Asked:
cat4larry
1 Solution
 
Dale BurrellCommented:
I've heard that there are issues with IE11 in that .net doesn't recognise the browser version I think. I haven't had to fix it myself, I just heard from a colleague. I suggest google the issue as it looks like many people have had it https://www.google.co.nz/search?q=ie11+asp.net+issue&oq=ie11+asp.net+issue&aqs=chrome..69i57j0l5.2796j0j7&sourceid=chrome&espv=210&es_sm=93&ie=UTF-8

Also the strange URL is the cookieless URL for ASP.NET it may well be the same issue, i.e. because its not recognising the browser its assuming that cookies aren't supported. So fix that and see if the URL issue goes away. If not look into cookieless asp.net sessions.

Sorry not to be more help. This may be enough to get you started, or someone else may pop by with the full solution.
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