Re: com.sybase.scc.jmx.ManagedObjectGateway.err_invoke_op SCC agent db2v105:9999 does not know Sybase IQ version string. Something is wrong with the IQ Agent plug-in.

NO, I'm asking you to post here the content of the file agent-plugin.xml which is located in /opt/Sybase/COCKPIT-4/plugins/com.sybase.iq (your installation) if you are trying to use COCKPIT or /opt/Sybase/SCC-3_3/plugins/com.sybase.iq for SCC

Dan