OAuth authentication failed since update to 7.5 SP16

[former_member296836]

Hi,

we have a RFC-to-REST scenario with OAuth to fetch a token in REST receiver channel that worked without any problems. After upgrade to 7.5. SP16 we receive the following error:

[EXCEPTION]

Ausnahme aufgetreten beim Adapter-Framework: HTTP OAUTH 2.0 RESOURCE OWNER PASSWORD CREDENTIALS GRANT call to https://<URL>:443/token not successful. Error while processing Authorization request!

com.sap.aii.adapter.rest.ejb.common.exception.HttpCallException: HTTP OAUTH 2.0 RESOURCE OWNER PASSWORD CREDENTIALS GRANT call to https://<URL>:443/token not successful. Error while obtaining authorization code - response code: 400
response:
{"error":"invalid_clientId","error_description":"Client 'xyz' is not registered in the system."}

Testing with Postman, the user is still available and I could fetch a token there (what I could before upgrade in PO as well).

Are there any changes in the OAuth process with the last updates?

Regards

Chris

[Bhargavakrishna · Accepted solution]

Hi Christian,

You can use https://requestbin.com/ to check the request that you are sending to the endpoint.

Login to this with your GitHub/Gmail account, copy the endpoint as shown in the below screenshot, and configure it in the REST communication channel where you have maintained the Authorization server URL to fetch the access token.

Regards

Bhargava Krishna

[former_member296836 · Accepted solution]

Dear Bhargava,

thanks for the hint. This helped me to compare the calls from Postman (successful) and PO (failed).

Next to some header parameters that were missing and that I added in the OAuth authorization configuration, I also see that SAP PO is sending an additional HTTP header parameter called "authorization". Unfortunately I can not compare if this was also send in the old SP version, but I had to suppress this header parameter to get a successfully response.

You can suppress this by adding the module parameter Oauth20AutorizationServerRequestType = none.

Thanks all for your support.

Regards

Chris

[former_member499364 · Accepted solution]

Can you share how the module tab was setup