Vsewss 1.3 is Failing Some Times in the Given Scenrio.

I have Deployed a WebPart and I am giving a SharePoint URL to Create  a WSP(Vsewss 1.3 generates you a direct WSP). With Computer Name If i am retrieving the site it's working fine. If i use the IP Address then it is giving error could not recognize the URL. Even if i give URL with IP also I am getting the Same Problem.

Visual Studio 2008 extensions for Windows SharePoint Services 3.0, v1.3 - Mar 2009 CTP

http://www.microsoft.com/download/en/details.aspx?id=21082

Note:-
This Will be installed only within a SharePoint Server.

Windows SharePoint Services 3.0 Tools: Visual Studio 2008 Extensions, Version 1.2

 http://www.microsoft.com/download/en/details.aspx?id=841

Windows Windows SharePoint Services 3.0 Tools: Visual Studio 2005 Extensions User Guide, Version 1.1

http://www.microsoft.com/download/en/details.aspx?id=7026