Go to Start>Run>Cmd> Type IPCONFIG press enter. take the defaulty gateway IP. copy it.
go to url adress. paste it . enter . login with admin details if u dont know google ur router and find the admin acc and pass example admin 1234 or root 1234/123456.
then go to portforwarding table find it on there and open port UDP and TCP on 44405 and 55901 port on ur IPv4 IP . not on ur default gateway IP
ex- def IP = 192.168.1.1/0.1 etc
ex- IPv4 IP = 192.168.1.102/101/100 etc
IPv4 IP = can be found at cmd>run>ipconfig > open the ports on it.
then.. run ur muonline server and go to
Open Port Check Tool put the ports and see if its success ;)