Endpoint Central PXE port in use

Endpoint Central PXE port in use

Hello, 
we are trying to configure/use the Os Deployment service but we got the following message:
Saying the port 69 was in use, we went to the link attached to it regarding on how to fix it but when we did execute the command that was mentioned we didnt get any result, as a matter of fact there wasn't any service using this port.
Could you assist us regarding this issue?

Thanks, regards

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