error while adding microsoft dynamics nav web services to .net application

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C#

ASP.NET

webservice

i am adding webservices file from microsoft dynamics nav into my .net
webapplication.. whenever i provide webservice link in addressbar on
clicking on app-webreference. i get this error ....

"There was an error downloading
http://localhost:90/DynamicsNAV/WS/Trading%20Ltd./Services Unable to connect to
the remote server No connection could be made because the target machine
actively refused it 127.0.0.1:82 Metadata contains a reference that
cannot be resolved:
http://localhost:90/DynamicsNAV/WS/Trading%20Ltd./Services There was no endpoint listening
at
http://localhost:90/DynamicsNAV/WS/Trading%20Ltd./Services that could accept the message.
This is often caused by an incorrect address or SOAP action.
See InnerException, if present, for more details. Unable to connect to
the remote server No connection could be made because the target machine
actively refused it 127.0.0.1:82 If the service is defined in the
current solution, try building the solution and adding the service
reference again."
the site is in build stage and what i am doing is just attempting to
add web services to access code and page of nav via webservices..

well i guess address is right.. is this the problem with firewall or i have missed something???
can anyone help me??? thanks in advance...