EndGetRequestStream - Unable to Connect to the remote Server

Hi,
I use HTTP pluggable protocol of .Net framework in my smart client. The application is being tested on 3 different machines and at one point the application sends 3 requests in quick succession to the web server.On 2 machines it works absolutely fine but on the third machine,one request,always the same request,fails with "Unable to connect to the remote server".All these requests go at the same web server.Stack trace reveals that the exception ocurrs at EndGetRequestStream method.Could anybody plz help me ?
bye
[538 byte] By [TirupathiRK] at [2007-12-26]

.NET Development

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