Okay, not sure where you are in the progress of this, but I will walk you through how to set it up.
1.) Ensure server is running (I know this seems silly, but I want to cover all the bases)
2.) Click the windows button, and open a command prompt by searching for cmd.
3.) Type in ipconfig, it will spit out a bunch of numbers, you are looking for your IPv4 Address under your Ethernet adapter Local Area Connection, usually something along the lines of 192.168.0.10, 10.0.0.10 dependent on your router and your ISP. Write down what it is.
4.) Create a NEW connection using the IP address you just wrote down. Delete any other copies of you have of your server that are already there.
5.) Test connection, if it works then you are good so far, if it doesn’t message me and let me know.
6.) If you already have no-ip set up, then keep it (I use it), check to make sure its up and running. Sometimes you have to refresh the host.
7.) Go into your router, set up port forwarding for 7001 (default) for Eclipse 4.0 to the same local IP address you used earlier (the one from step 2), If you can not configure your router, you will have to contact your ISP and have them do it for you.
8.) Go into you Server List, delete all copies of your connection to your server (Do this for troubleshooting later on to make sure you don’t try to use the wrong one)
9.) Create a new server for your no-ip address, should be something like yourservername.ddns.net
10.) Login and enjoy. If this doesn’t work let me know in a PM and I can go into more detail about your specific hardware.