I install the bitcoin 0.16.2 and build one bitcoin.cfg in testnet3 as follows:

rpcuser=test
rpcpassword=test
rpcport=18332
daemon=1
server=1
gen=0
testnet=1
listen=0
maxconnections=100
rpcallowip=0.0.0.0

Now the nicehash can not connect it .....

Maybe I need to run a pool program like p2pool?