The HTTP job may fail if the remote (server) SSL certificate is not added to agent's keystore.
java.security.cert.CertificateException: signature verification failed - Certificate issuer: CN=Some Root CA s not in the client keystore.
The certificate has to be added to the keystore.
Release : 11.5, 11.5, R12
Component : CA Workload Automation System Agent
The WA Agent can automatically add any new certificate to the default keystore cacerts in the agent install directory. Add the following parameter to the agentparm.txt and restart the agent.
For more information on parameter and to add the certificate manually, refer to this link.