LinkedIn OAuth returns unclear error

Question

In response to an oauth request, LinkedIn redirects user back to my server with the following parameters:

GET /auth/linkedin/callback?error=server_error&error_description=f228ff35d9f7f99ee891ff1e9b056a7a2e4b8429b84de8d7&state=the+authorization+server+encountered+an+unexpected+condition

Moreover, according to LinkedIn API, error_description is "A URL-encoded textual description that summarizes error.", which is not the case here.

Here's the original request:

https://www.linkedin.com/uas/oauth2/authorization?client_id=************&redirect_uri=https%3A%2F%2Fwww.mydomain.com%2Fauth%2Flinkedin%2Fcallback&response_type=code&scope=r_basicprofile+r_emailaddress&state=cc167e16fcc8039277cae38dc02d08bf526c955ceb403513

How can I find out the actual reason for the failure?

My stack:

• Rails 4.2.3
• omniauth 1.2.2
• omniauth-linkedin-oauth2 0.1.5

Answer 1

We had a similar issue, and it was caused by a trailing space in the username field on the LI OAuth form.

I'm not sure why it didn't happen on other sites with LI Oauth access, but someone from LI has been able to validate it for us. This issue should be resolved very soon (Or so we've been promised)