Blocked a connected device and still has access to my computer

i have blocked the connected device (Home #7) from accessing my computer but apparently it’s still trying to establish connections on my computer. i can see attempts at performing handshake (SYN) which gets rejected, or some weird activity on my computer. what would be the cause for this? if i blocked that connection, i want to make sure it doesn’t have any way access to my computer.

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