same problem as mi99,
briefly, installed and updated java to version 6
downloaded proxy and unzipped into java v6 bin folder
changed remoteip into ip of server
changed ip of server in server.dat(under co folder) into 127.0.1.1
ran qoproxy.bat, the cmd remains.
starts co, tries to login into the server specified in remoteip
connection failed due to server maintenence or internet conjestion.
so i tried this,
changed server ip in server.dat(co folder), to original ip of server : 69.***.***.***(eg.)
co runs finely.
help needed here, appreciated

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edit : looked on all pages and i found the solvations to it
peeps whu had the same problem look here
find all wad ur ip address is by goin to start>run>cmd and type in : ipconfig
paste wadeva it shows on ip address : *** *** *** into ur qoproxy config file under proxyip.
den go into ur co folder, edit ur server.dat, whichever server u're playing at, replace the server's ip to ur ip address tt u've gotten above.
it shld help
thx to the sum1 whu made the fixing proxxy thread x.x forgot whu was it x.x
cheers