Applet not communicating with servlet when given ip address (not localhost)

I have a strange problem with my applet -
I have a java applet and a Tomcat server running. I am able to communicate between the applet
and a servlet on the server (sending strings from applet to servlet, for example..) when the
URL that I write in the applet is -
"http://localhost:8080/ProjectName/ServletName "
BUT - when instead of that "localhost" I insert my ip address, it throws the exception:
java.net.ConnectException: Connection refused: connect
in the line -
urlConn.getOutputStream(); (urlConn is the HttpURLConnection that I created with the URL)
also, I did port forwarding (I have a router)
so that 8080 port will be directed to my computer, and tested the forwarding, and it does work.
Does anybody know why there is a problem?
Thank you.. :)

>
well, in the final version of the project the applet will be signed.. >Uh-huh..
>
but, I got tired of signing it every time I edited the code, so now I just simply run it as a "java applet" project
from the eclipse.. NOT as a signed jar..>Eclipse has Ant built in. Write a script that will compile/build/sign the jar for you, then build it to the point of being signed for every test run. (Just today I was making some changes to a signed applet project that does just that - I probably built it 25 times before I was happy with the changed code - not a problem.)
>
you think that's the problem ?>Yep. Not that I provide support for Eclipse, nor know how it goes about launching applets (trusted or sandboxed).

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