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Does the Cox Modem block ports?

I opened a port on my router but it's still showing blocked (it's not on the list of cox's automatic blocked ports either). Do I need to open the port on the modem as well?

I tried to download cox network manager but it doesn't download and there is no "get started" button. And if I click on the "learn more" it downloads some cox framework that doesn't open with any program...   (I tried several browsers including IE, all up to date)

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Valued Contributor II

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2.8K Messages

What port is it?

Also, do you have the application open that uses the port when your test?

Also, how are you testing if the port is open?

Also, have you tried with any Antivirus or firewall on the PC temporarily disabled?

Last, do you have a modem or a gateway? If it has more then 1 Ethernet jack on the back it's a gateway. If not, then its a modem and no port forwarding is required. It's a transparent bridge, just switching the HFC to Ethernet and visa versa. 

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Turns out it was a setting in my application. It's working now. Thank you anyway :)