IE Enhanced Security Mode and Turning it off
Refer to Zenapp for original post. I have added a little bit myself.
IEESC (IE Enhanced Security Mode) is a very good feature on most servers – you shouldn’t be doing much web surfing from your server’s desktop anyway and this helps protect you from malware, which is the last thing you want on a Windows Server system.
Of course if Microsoft had any guts IE would be disabled by default, but I digress.
Is it on or off?
The obvious way is to start IE, and your home page is set to res://shdoclc.dll/hardAdmin.htm, which shows you it’s enabled. This is not accurate because I can manually set my home page to this address, and it will shows it’s Enabled, even it’s NOT. As shown in the following picture.
Turning off IE ESC Manually
On Windows 2003 Server it was easy – just open up Add/Remove Programs and remove the component from the server – IE becomes fully opened up.
Click it and you should see this box – by default a XenApp 6 server will have IE ESC turned off the users (cleverly) but on for administrators (annoyingly, especially if you are an administrator and you actually use Citrix). Configure as you see fit – personally its Off for both for me on all Citrix servers.