Since its a long time problem now that rebinding instances is not possible I decided to post the problem here.
So I just want to quickly rebind all of my web interfaces because I got a 2nd IP. But Its simply not possible. The quintessence of the log says "The IP address and port combination is already in use by another instance." nevertheless, I posted the whole exception here.
I have the following setup for my instances setup and I want to issue this command
./ampinstmgr --RebindInstance EHGMC 126.96.36.199 25577
but it doesn't let me. I also tried
./ampinstmgr --RebindInstance EHGMC 188.8.131.52 25578
this before the other command to avoid the same port but it didn't work. Stopping all instances before didn't help either. I know that I could edit every config file of the web interfaces but this would cost me so much time. I hope you can fix this :)