Running exchange 2003 on server 2003. ASP.NET 2. all service packs are latest on everything. I can login using OWA on computers that are domain members using just my domain login name and password. but from other computers i can't login. It will re-prompt with the webdomain\username. it doesn't matter what combination of domain names and usernames i use, i can't login. Active directory integration is checked. default domain and relm are correct. is this a syntax issue? or a setting? both clients are using IE6. note: I can login on both computers using Firefox so I'm wondering if this is a browser setting.

If you are using Forms Based Authentication (FBA) you should only have basic authentication enabled on the /exchange vdir. If you are not using FBA in addition to Basic authentication you will want integrated Windows Authentication checked. If this will be available outside of your network you should also have a SSL certificate installed.

This kb number http://support.microsoft.com/kb/327843/en-usmaybe can help you find out issue.