Did you add the ip address or hostname to the $SPECROOT/.hostrc file on the MLS system?
Ensure the new OC is configured to point to the MLS system. This can be checked by looking at the locServerName parameter in the $SPECROOT/tomcat/webapps/spectrum/META-INF/contect.xml file.
Ensure there are no issues with hostname resolution between the MLS and OC systems
Ensure there are no network issues between the MLS and OC systems especially firewalls
Ensure the adminUserName parameter in the $SPECROOT/tomcat/webapps/spectrum/META-INF/contect.xml file is a valid Spectrum User model in the MLS database.
Joe