Sorry to wake this old post. I am getting this same error except the agent name is blank. Did you find a solution? We have EM version 8.0.00.900, CM Server version 8.0.00.600 and Agent version 22.214.171.124. Agent and server are both set to protocol 10.
Request rejected by Data Centre
CTM5330 Agent is Unavailable. Request view JCL failed.
Get script request failed.