ASP.NET exception Event ID 1314
an unhandled exception has occurred event code 4011
On one of my web front-end servers, I was receivning this error. The page was intermittently having trouble loading from one node of the cluster. I was seeing generic Windows SharePoint Error pages, but mostly 403 errors.
Adding the servername\Users Read (Read & Execute, List Folder Contents, Read) permissions to the \bin folder in the IIS virtual directory solved the issue for me.