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URLDecoder: Illegal hex characters in escape (%) pattern or Client authentication failed error when requesting an OAuth2 access token in Identity Cloud or AM (All versions)

Last updated Aug 18, 2022

The purpose of this article is to provide assistance if you receive a "URLDecoder: Illegal hex characters in escape (%) pattern" or "Client authentication failed" response when making a call to the OAuth2 access_token endpoint in ForgeRock Identity Cloud or AM using a basic authorization header. You may see this in Identity Cloud; AM 6.5 and later when the client ID and secret are not URL encoded, or in earlier versions when one or both of them are URL encoded.



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