Custom port

If you running chain more than one in server

Check available port

For Cosmos Ecosystem

sudo lsof -i :1317 -i :8080 -i :9090 -i :9091 -i :8545 -i :8546 -i :6065 -i :26658 -i :26657 -i :6060 -i :26656 -i :26660

If return nothing, no need to change default port

Check port based on your own

sudo lsof -i :<your-port>

Check port based on user that used

sudo lsof -i -P -n | grep <your-user>