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Thanks for the advise! I downloaded all versions of the essentials and tested them. The 3rd april 2010 version was a bit strange with audio, so i took the latest version from the wiki (from 5th september 2010). Now the connections work.
I have already been searching for solutions for my problem, but i sill don't know the answer.
First, i had an error message which popped up when i entered a linked map. I read this thread fixed it by deleting the connection in the connections.txt file. However, now there is the following...