When configuring the Connected System Object to use OAuth 2.0, pressing Authorize returns the following pink box error:
When using OAuth with a Connected System in Appian versions 17.4 to 18.2, Appian is using basic authentication but is also sending the 'client_id' and 'client_secret' credentials in the post data of the request against the token endpoint, as well as in the authorization header. This causes authentication against certain systems to fail with the above error.
This issue has been addressed in Appian 18.3.
Upgrade to Appian version 18.3 or higher.
This article applies to Appian 17.4 to Appian 18.2.
Last Reviewed: October 2018
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