Thanks for reply but after using this http://quonos.nl/oauthTester URL
I got my base string is ok and still I not able to find out how to
resolve this issue.

On Nov 2, 12:32 am, Tom van der Woerdt <i...@tvdw.eu> wrote:
> Hi,
>
> Most 401 Unauthorized errors (and especially the ones involving UTF8
> characters) are because of errors in the Base String, used to generate
> the signature.
>
> Please use the validation tool at <http://quonos.nl/oauthTester>, it may
> help you a lot with validating your Base String. As access_token always
> involves usernames and passwords, please do substitute them with dummy
> ones for security reasons - just make sure that they at least look like
> the previous ones, because otherwise it would be hard to detect encoding
> issues.
>
> Tom
>
> PS: When dealing with encoding issues, XXXXXX'ing the values really
> doesn't help.
>
> On 11/1/10 6:58 PM, pawan wrote:
>
> > Hi,
>
> > We have created a Desktop Twitter application, In this application I
> > have usedXAuthfeature to get data from "Twitter API". It works fine
> > on Win 7 Ultimatemachine. However when I run my application's exe on
> > core "Chinese" Win 7machine, I got "The remote server returned an
> > error: (401) Unauthorized." error from following request:
>
> >https://api.twitter.com/oauth/access_token?oauth_consumer_key=XXXXXXX...
>
> > Can anyone help me out to know how to resolve this issue.
>
> > Thanks,
> > Pawan

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