The Trusted configuration had changed between 11.5 and 11.6. It will have to be redone. It now uses either a DB2 or MySql database. See Setup Trusted Access
To migrate the XCOM trusted file from a XCOM V11 system to XCOM V11.6, please follow the instructions below:
1. From V11 export the trusted registry path
2. On V11.6 do an import of the registry file
3. Make sure that you’ve created the database created with the proper tables for Trusted
4. Make sure you can connect to that database
5. Run the XCOMTRST utility.
Also have a look at chapter SETUP TRUSTED ACCESS
in the CA XCOM Windows Guide.