Toad for Oracle 17.0.353.2906
Database 19c (19.22) Single Tenant
Oracle 19.22 Instant Client
Have been experiencing this issue for quite some time.
Created a new connection to a CDB using direct tab. Hit the test button and get the pop-up "SSH Host is required". Close the pop-up and test again with the same results. Then I hit the SSH button, cancel it, and the test completes successfully.
Regards,
Doug