How do I fix this: JVMCFRE003 bad major version; class=com/ibm/CORBA/iiop/ORB, offset=6

This is the second time I have seen this being reported. I did not find out the root cause the first time round as my client could not provide the detailed information that I requested. In my own testing (back in last year), I managed to run CSM _Agent_ on both Tomcat and WAS. On Tomcat, JSR160RMI and RMI both worked fine but SOAP appeared problematic. It was the opposite on WAS, where only SOAP worked. I don't recall seeing JVMCFRE003 myself. So maybe you can try SOAP?