There are two ways of using rcon, there is the usuall in game rcon and an external application. The external application does not work at this time. First thing is you have to connect to the rcon server through in game console you do so like this:
rcon_connect addr:server ip port:64087 pass:rcon pass
After you have connected you will not recieve a message saying it connected, you cn test the connection with a simple say command. to issue a command would be:
rcon_command "rcon command here"
commands are as follows
sv_restart - Restarts the round. sv_say - Broadcasts a message to all clients. g_nextlevel - Switch to next level in rotation or restart current one. ban - Bans player for (ban_timout) minutes from server. [See ban_timeout] ban_remove - Removes player from ban list. ban_status - Shows currently banned players. ban_timeout - Ban timeout in minutes kick - Kicks player from game kickid - Kicks player from game kill - Kills the player net_next_map - Notify clients of the next map to play