how to check if a port is blocked on a windows server

I have a windows server 2008 machine which has qlikview application installed and this application has stopped working from last week, the application services were stopped. I’m unable to start the services(services are configured with the local account). As part of troubleshooting, I checked netstat to verify if the application ports are opened. I could not see on the list a couple of application related ports( eg. 4799, 4750). How do I verify if the ports are open or blocked on the server?


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