SM59 Authorization test (SNC required for this connection)

Hello,

I have just recently setup SSO in our test systems and received some intermittent error when checking the authorization test of RFC ABAP Connection. We have specific job that's connecting to our EWM test to ERP test system via RFC ABAP Connection. The job sometimes successfully finished and sometimes not. It is giving error "SNC required for this connection" and when I checked the target system in SM59 and check the authorization test it is giving the same error. But after some minutes the authorization test went successfully and the job was successfully finished also.

For SSO this are the parameters I set:

Any idea on this error?

Additionally, I checked sm21 and st22 but I didn't find anything related to the error. Also in our development systems where SSO is also setup, we didn't received the same issue.

Regards,

Florence