You do not need to open any ports to run a validator, but to expose it publicly you can open any of these ports
26657 - tendermint rpc
1317 - lcd
9473 - GQL Playground
You do not need to open any ports to run a validator, but to expose it publicly you can open any of these ports
26657 - tendermint rpc
1317 - lcd
9473 - GQL Playground