Make sure the game isn't running in LAN mode. Try restarting your router, resetting filters, hitting refresh a few times, making sure no 3rd party firewalls are blocking Pluto, etc.
If everything else fails, use a VPN.
@samferreira10
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you're using some rg mechanics mw3 repack, that won't work with pluto. https://plutonium.pw/docs/install/#installing-the-base-game-modern-warfare-3