I was using Windows XP professional and IIS 5.1 and visual studio .net for developing my web application.I was using this for my development purpose.So there was no person accessing the webpage other than . But i got an error saying

The page cannot be displayed
There are too many people accessing the Web site at this time.

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Please try the following:

Click the Refresh button, or try again later.

Open the localhost home page, and then look for links to the information you want.
HTTP 403.9 – Access Forbidden: Too many users are connected
Internet Information Services

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I could manage to find a solution that by disabling ‘HTTP Keep-Alives Enabled’ in your IIS you can free connections which are not being used and that space can be used for further connections.
this can be used in testing and development machine without any problem.
To disable HTTP Keep-Alives

Go to IIS

Right click on Default Web site

Click on properties

go to Website tab

Set connection time out to a smaller value

uncheck HTTP Keep-Alives Enabled

Apply Changes