You can't run multiple servers on one port. Open the server.properties file of one of your servers, and change the value of server-port to something other than the default (25565).
You do not need to own Minecraft to host servers for it.
Port forward it.
Yes, you can run multiple apps over the same port using different ip addresses
Minecraft servers cost money to run, it's not likely someone will give you a server for free. Servers require a computer, internet connection, and electricity and all of these cost money.
You do not need a Minecraft account to set up a server, so unlimited. However most computers can only run one server at a time
You can't. Servers are run on a computer with a special program. You can make your own server though!
The best way to maximize the space on the application server by clustering the servers is grid computing. You can read more about it at http://www.oracle.com/technologies/microsoft/docs/grid-computing-windows.pdf Clustering allows you to run multiple services on one machine or on multiple machines. Servers can be arranged to maximize space with multiple servers running.
Go to Start -> Run -> type %appdata% Delete the folder titled: .minecraft Go to wherever you keep the Minecraft launcher (The icon is the block of dirt) and run it! It will re-download the files, fresh and new. [Beware though; deleting the .minecraft folder will REMOVE all your worlds, servers, texture packs, screenshots, mods etc.]
By default, most web servers are run on port 80. You can change this in the server's configuration file to something else, but then a web browser may have trouble accessing it.
Make sure all instances of Minecraft Server are closed, also another application could be using the port. Try doing killall java then run the server.
This happens if the minecraft launcher can't get access to the minecraft servers. If you play the game from the website first, then you will get access to an offline version through the launcher
Yes. In the servers justright click and delete the world file. Then click run server. It. Will make a brand new world.