Here are the steps to resolve the issue you are facing:
Check if all the devices connected to the old server have been successfully migrated to the new server after running the "Change Administration Server" task.
If all the devices are not listed under the new server, run the "Change Administration Server" task again.
Verify if the network agents have been updated to version 14 on all devices. If not, you can run the deployment task again for the network agent 14.
Check if the security application version 11.11 is installed on all the devices. If not, you can run the deployment task again for security application 11.11.
After completing these steps, verify that the devices are functioning normally and that the security applications are updated to the latest version.
Finally, you can test the security applications to make sure that they are working properly and that your network is protected.
Note: These steps are a general guideline and may vary depending on your specific setup and configuration. If you encounter any issues, you can consult Kaspersky technical support for further assistance.