Session not maintained on Internet Explorer

Hi, I am trying to install XWiki on my company�s intranet for online project management. I am having trouble using Internet Explorer with XWiki. When I login as a user, I can see my name on the top right hand corner and I can also see the all the admin options on the top action bar (I have admin privileges), which means that I have Logged in successfully. But as soon as I click on a link, the page refreshes and I find that I am logged out. All the admin options are gone. This happens for all the links On further investigation I found that this problem occurs only when I use a url of following type- http://machineName:8080/xwiki If I use following url, it works fine http://localhost:8080/xwiki I found that a cookie gets created in �C:\Documents and Settings\userName\Cookies� when I use localhost, but there is no cookie for the machineName. So when the application finds that there is no cookie, it thinks that user is not logged in, and shows default pages. The interesting thing is that it works fine with Firefox/Mozilla. Since most of our users use Internet Explorer, I am trying hard to get it working but till now I have no clue how to fix this problem. I have enabled all the cookies, kept the intranet security at lowest level and bypassed the proxy, still it�s not working. I have also selected �NO� for the preferences �Always authenticate on viewing� and �Always authenticate on editing�. I tried searching on the internet but it seems no one else has faced this problem earlier. Please suggest a solution. My environment is � XWiki 0.9.840 Windows XP SP2 Tomcat 4.1.31 MySQL 4.1.19 JDK 1.5 Looking forward for your help. Thanks, Chandra