Thanks for your contact. Could you provide some more details on how your DirecTV is connected to your Viasat internet? From my understanding, this connection was made via Wi-FI, is this correct? If so, resetting the network settings on the DirecTV device should make it unable to connect. If possible, turn your DirecTV off and unplug it for more than 20 seconds, turn it on again, and perform the reset on the network settings. If that does not work, please let us know and we can try to verify if something can be done on our side.
However, I’d still recommend checking with DirecTV support to see if there’s a solution that does not include resetting your router’s password, since they are the ones that can provide you with specialized support on that.