I have the same problem. "An error occured while setting up the RPC port 49883 for listening: open: An address incompatible with the requested protocol was used."

I used the most updated eternalcoin.conf file:

#EternalCoin Config

server=1
rpcport=49883
port=49884

#change these to anything, can just copy later when needed
rpcuser=YourUsernameHere
rpcpassword=YourPasswordHere

addnode=69.90.132.47
addnode=162.242.156.243
addnode=85.25.146.82
addnode=76.71.156.73
addnode=70.51.155.179
addnode=70.72.14.12
addnode=116.9.109.191
addnode=188.162.38.222
addnode=83.85.56.15
addnode=82.31.140.32
addnode=116.212.203.138
addnode=2.92.65.101
addnode=95.105.19.254
addnode=89.212.99.205
addnode=31.221.88.106
addnode=192.241.215.76
addnode=218.81.107.169
addnode=198.98.118.241
addnode=54.205.160.65
addnode=46.105.96.190
addnode=54.204.54.238
addnode=54.197.167.39


rpcallowip=127.0.0.1
rpcallowip=192.168.0.1

#set this to 1 to mine in client
gen=0

#set this to -1 for improved in-client mining
genproclimit=1