Solution to WebSphere Portal login problem in IE

Problem:

You can not get login to WebSphere Portal Server in IE, once you click submit button, the log in page is reloaded without errors, however, everything works fine in Firefox.

Check:

1. Access WebSphere Portal using IP address in IE. if it works, then it is the problem with hostname.
2. Check the technote http://www.ibm.com/support/docview.wss?rs=203&uid=swg21217671, if you match some of cases mentioned there.
3. If technote does not help, then check the SSO setting in WebSphere Application Server
    1). Open WAS Admin Console
    2)  Security -> Global security -> Authentication mechanisms -> LTAP -> Single Signon
    3). Check the domain name. If the name is less than 5 characters excluding the period, such as, "co.de", then change it to a reasonable long name which matches your company domain, like "ibm.co.de";
    4). Restart WAS and Portal Server
    5). Load the Portal Server with the fully qualified hostname, http://wps-ibk-1.profile.co.at/wps/portal
    6). Login. It should work now.