Failed to refresh access token. See inner exception for details.

[Bob Bowles]

Today,  we started receiving "Failed to refresh access token. See inner exception for details." on all AdWords API calls.  We did not make any code changes.  This just started out of the blue. We tried generating new credentials and a new refresh token but still get the same error.  We have been using the AdWords API for years without issue and then suddenly this problem.  Does anyone have a suggestion?

[Bob Bowles]

UPDATE: The errors are happening when a user performs a function in our admin web app that makes calls to the AdWords API.  We also have a console app that runs automated updates on a daily basis.  The console app is not having any problems.  Just the web app.  Both apps have always used the identical code and credentials.

[googleadsapi...@google.com]

Hello,

As your same set of credentials are working with console app, could you please confirm that if your web app is pointing to the right property file? Also, you can try the CURL request provided below and see if you are able to generate the access token. If your credentials are correct, you should be able to generate an access token for the below CURL request.

curl https://www.googleapis.com/oauth2/v4/token \
-d refresh_token=your-refresh_token \
-d client_id=your-client-id \
-d client_secret=your-client-secret \
-d grant_type=refresh_token

Thanks,
Milind, AdWords API Team

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[Bob Bowles]

I actually just found the problem 5 minutes ago and was about to update this thread.   dependentAssembly entries had been removed from the web app's web.config.  Once I added them back, everything ran fine.

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