How to run multiple node in same machine? I have created an altcoin base on litecoin source code. I want to test it in multiple node to test peers of each node weather each node can connect to each other. So I try to run "mycoind" in multiple but it not work. Any way for me to run multiple node in same ubuntu machine?
Your problem here is nodes are trying to use the same port Accept connections from outside.

You have to change the default port or disable listening.

-port=&lt;port&gt;    Listen for connections on &lt;port&gt; (default: 8333 or testnet: 18333)


or 

-listen Accept connections from outside (default: 1 if no -proxy or -connect/-noconnect)


If you want to add another peer just simply add "-addnode:127.0.0.1:" to mycoind command.