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To use the streaming service you must create an inbound and outbound exception in your firewall. If you have changed your port number from the default in 123 Copy DVD you must change the port number for the exception rules to match.
To create the exceptions using Windows Firewall:
Open Windows Firewall from Control Panel -> System and Security and click Advanced settings from the sidebar on the left.
Select Inbound Rules from the left sidebar. On the right click New Rule.
For the Rule Type select Port and click Next.
For the Protocol and Ports select TCP and enter 12321 for the port then click Next.
For the Action select Allow the connection and click Next.
For the Profile make sure Domain, Private and Public are checked and then click Next.
For the Name enter 123 Media Streamer and click Finish.
You will need to repeat the above steps for Outbound Rules to complete the exception for media streaming.