Installation or upgrade fails on RHEL version 9 and later
Installing or upgrading on RHEL version 9 and later fails if you were using default certificates.
Problem scenario
You are using a product version earlier than 10.2.1 with default certificates and you plan to upgrade to version 10.2.2, or you have upgraded to version 10.2.1 with default certificates and now plan to upgrade to 10.2.2. This problem can also occurs if you perform a parallel upgrade from versions 9.4 or 9.5, which require a fresh installation of IBM® Workload Scheduler components. If one or more IBM Workload Scheduler components are installed on RHEL version 9 or later, the upgrade or fresh installation fails.
AWSRES003E The REST service cannot be contacted. Check if the service is
running or the existence of firewall rules or some issues on the dns side resolving
the server hostname that could prevent contacting the service.
Cause and solution
The SHA-1 signatures contained in the IBM Workload Scheduler default certificates are not supported by the OpenSSL libraries embedded in RHEL version 9 or later. This is a known problem with RHEL version 9 and later. For more information, see Bug 2055796 - Enable SHA-1 signatures through LEGACY policy configuration.
To work around this problem, perform the following steps: