Using teamviewer directly over lan stopped working

I installed teamviewer to connect over LAN directly and it worked fine. But during a session it stopped working and I can not get it to work again. What could be the problem? 

P.S. This could be in the wrong group and my apoligies for that, but I could not find a more appropiate group in the group picker. If there is a moderator feel free to move this post to a more appropiate group

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