i had the same problem and here is its fix,
as u have Eset nod32 antivirus v3.0.621 (same as me) , the problem is from this AV that dont allow connections to be made to Visual Studio ASP.NET Server .
now follow these steps to solve this issue:
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DoubleClick on Nod32 icon on tray and Open it up.
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if it is not in "Advanced Mode" , switch to Advanced Mode. ( you can do it by clicking on the bottom-left link "Display:Standard Mode" and then click on "Toggle Advanced Mode" )
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then goto SETUP section. then on the Right Pane click on "Antivirus and Antispyware protection". the panel should be opened.
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now in the "Web Access protection" click on "Configure..."
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from the left Tree go to path : "Web access protection > HTTP > Web Browsers"
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now you should see visual studio 8 "devenv.exe" in the list .
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click on it twice till you see a cross sign in the box. ( Note on CROSS sign , not mark sign ! )
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with this cross sign you tell the Nod32 that this program should not be scanned and filtered for web access.
due to this steps , my problem solved and now i can access my page from localhost:<portNumber> .