It means with update 11 it is working fine however with update 12 it is not? Can you check the event logs for any relevant info?
Also. try to install the update 12 once again from the steps mentioned below -->
Copy the hotfix_012.jar to C:\ColdFusion10\jre\bin
Launch Command prompt as Run as Admin and then change the directory to C:\ColdFusion10\jre\bin as cd C:\ColdFusion10\jre\bin and then type java -jar hotfix_012.jar
Follow the on screen instructions and then restart the service. Then run the wsconfig.exe and try to recreate the connector.
Thanks
VJ