0 
<script type="text/javascript">
//<![CDATA[
if (typeof(Sys) === 'undefined') throw new Error('ASP.NET Ajax client-side framework failed to load.');
//]]>
</script>

Sys is undefined and the error is being thrown on an ASPX page but only in IE10. Opera, Chrome, FF, and Safari all work fine! I've dropped IE security to the "Low" position in case it was a permissions issue of some kind, but no joy.

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  • possible duplicate of ASP.NET Ajax client-side framework failed to load Commented Jan 8, 2014 at 22:00
  • This only happens in IE. Other browsers are working fine, so I surmise from that fact that it is not an IIS issue. The server seems to be working fine. Commented Jan 9, 2014 at 4:18
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