Thanks for your reply,
Using IP address (https://IP Address) its working fine in IE, the problem is only when using the DNS (example https://tableauprodserver.com). we tried it out in Chrome ,Firefox etc., and it seems to be fine. Something funky is going on with the D.N.S. and we can't figure out why using D.N.S. its not working.
I'm not a network engineer so I could be wrong but I believe if it truly was a DNS issue then you would have the same problem regardless of the browser being used. So it appears to be a browser issue, not a DNS issue nor a Tableau issue. The Domain Name Service is not part of the browser.
Are you positive you are not in Compatibility Mode as per Russell's post? You need to confirm you are using the latest version of IE and are not in Compatibility Mode.
Have you totally cleared the browser cache for IE?