Thanks to Larry Reski, here is the list of KB articles related to enterprise portal. The KB articles are avialble in PartnerSource and CustomerSource.
KB Article Title
You cannot grant a user access to an existing Enterprise Portal site after you assign a user relation to the Enterprise Portal Web site in Microsoft Dynamics AX 4.0
Checklist of actions to perform before you install Microsoft Dynamics AX 4.0 Enterprise Portal on a computer that is running Windows SharePoint Services 2.0
Error message when you try to create a SharePoint Web site in Enterprise Portal in Microsoft Dynamics AX 4.0: "The Web site http://<machinename>/sites/EP was not created correctly"
The Validate button and some tabs are unavailable, or an item in a list in a combo box is not selected on an Enterprise Portal Web site in Microsoft Dynamics AX 3.0
After you convert a sales quotation to a sales order, the Warehouse field is blank on the Setup tab of the sales order in Microsoft Dynamics AX 4.0
Error message when you send an e-mail message in CRM for Enterprise Portal in Microsoft Dynamics AX 4.0: "Error executing code: smmInit object not initialized"
You cannot log on to an instance of Microsoft Dynamics AX 4.0 Server after you move the instance to a new domain
You cannot log on to Microsoft Dynamics AX 4.0 through .NET Business Connector by using Enterprise Portal (EP), Application Integration Framework (AIF) Web services, or a custom ASP.NET Web application
The first row values are incorrect when you use a Web grid as a display method in Enterprise Portal in Microsoft Dynamics AX 4.0 with Service Pack 1
Some enumerated text values are overwritten in the "Product Builder approval" dialog box when you configure a product model for a sales order in Microsoft Dynamics AX 4.0
You are repeatedly prompted for your user credentials when you try to log on to a Microsoft Dynamics AX 4.0 SP1 Enterprise Portal Web site
How to enable X++ debugging if you run Microsoft Dynamics AX 4.0 on an Enterprise Portal Web site and the .NET Business Connector is installed
Columns incorrectly appear on the Enterprise Portal Web site after you set the Visible property for some columns to "No" in Microsoft Dynamics AX 4.0
The compatibility between the components of Microsoft Dynamics AX 4.0 and 64-bit versions of operating systems
Important considerations to deploy Microsoft Dynamics AX 4.0 as a Web site
Error message when you click the ellipsis button in the URL field in Microsoft Dynamics AX 4.0: "Error in URL property error"
The overrided sort method does not work when you run a Web form in Microsoft Dynamics AX 4.0 with Service Pack 1 installed
Dynamics AX 4.0 may require profile single process rights on the AOS server and the IIS server hosting Enterprise Portal