If the issue still persists, refer to the following Microsoft KB Articles:
Article ID: 823552 - "You Receive a "Service Unavailable" Error Message When You Browse a Windows SharePoint Services Web Site":
http://support.microsoft.com/default.aspx?id=823552
Article ID: 171050 - "Event ID: 1005 "Name service is unavailable" is logged": http://support.microsoft.com/default.aspx?scid=kb;en-us;171050
Article ID: 885654 - "A user receives a "Service Unavailable" error message when the user browses your Web site that is hosted on IIS 6.0":
http://support.microsoft.com/default.aspx?scid=kb;en-us;885654
Article ID: 842493 - "You receive a "Service Unavailable" error message when you browse an IIS 6.0 Web page on a Windows Server 2003-based domain controller": http://support.microsoft.com/default.aspx?scid=kb;en-us;842493
Article ID: 831135 - "Clients receive a "service unavailable" error message in their Web browsers when you run many application pools under separate identities in IIS": http://support.microsoft.com/default.aspx?scid=kb;en-us;831135
You may also find the following information helpful: http://briandesmond.com/blog/archive/2003/09/20/203.aspx
You can also try to turn off the Rapid-Fail protection in the application pool. The procedure can be found in the "Troubleshooting Common IIS Errors" MSDN library: http://msdn.microsoft.com/library/default.asp?url=/library/en-us/iissdk/html/5d8a5d43-66f9-4185-8270-804d1dc4d4ca.asp
Make sure you have the Web server to allow "bypass traverse checking" the following KB artcle expalins this.
https://technet.microsoft.com/en-ca/library/cc739389%28v=ws.10%29.aspx
If none of the above articles help to resolve this issue, please contact Microsoft Support for assistance.
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