I had not opened my coin2 wallet whose version is v0.6.3.0-ga19eb2d-beta long time! I opened it yesterday, had been waiting for long and still donot have no any connection yet! Can any one tell me how to sync my wallet? Is the client too old?
Yes, you are using the old wallet and you probably missed the coins exchange for new PoS coins.
You can download the new wallet here:
http://sourceforge.net/projects/coin2project/I hope that you don't have to much old coins.