Dedicated Server only localy avaiable

Hey,
I set up my dedicated Server on my old PC, but only I can find it(guess because I am in the same Network).
I tried everything, open up Ports on my Friends PCs, opened up the PC on my Router and the PC, disabling the Firewall, nothing worked.
PLEASE HELP ME
Dropbox link to my configurations: https://www.dropbox.com/sh/1a6tbgwy62vd2yn/AAAwSg7aFnzbg0FBQ5oH55Daa?dl=0&m=

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