Getting this error

venv/bin/python bin/sentinel.py
[Errno -2] Name or service not known
Cannot connect to madcoind. Please ensure madcoind is running and the JSONRPC port is open to Sentinel.

My coin.conf

rpcuser=mtx_demon
rpcpassword=mypassword
rpcallowip=127.0.0.1
listen=1
server=1
daemon=1
rpcport=9918
logtmestamps=1
maxconnectons=256
masternode=1
externalip=107.191.43.39:21525
bind=107.191.43.39:21525
masternodeprivkey=mykey
addnode=140.82.39.247:21525
addnode=45.64.254.43:21525
addnode=150.129.80.244:21525
addnode=165.227.195.184:21525
addnode=172.107.167.138:21525
addnode=113.212.123.42:21525

Anything wrong?
RPCPORT IS IT 9918??