You need to be an admin or an op
Go in the console and type your preferred name in. The server console of course.
Rcon allows for a client to talk with the minecraft server (think remote console)
If its not your server you can not, the server owner only can. If you have your own server, go into the console of the server and type in /op YourMinecraftUsername
Access management console
Maybe the server is down?
If you have a normal server, you have to op people from the console to give them permissions. If you have a craftbukkit server, you can download a plugin for permissions.
There are 2 ways to run a server. 1. Make a server that you need to keep the console on (Which is free) 2. Make a server that you don't need to keep the console on (Which is not free)
Make sure the plugin isn't outdated, and check what your console says.
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No, you do not. You can host a Minecraft server as long as you have connection. Please note that you need to open your ports on your router to make a Minecraft server. If you do not have access to this, you can download a VPN-software like Hamachi or Cisco.
If you have access to the console, you can use "stop". If not, it would be very hard (Google it).
You don't need to unblock any just uninstall and install again.