Guiminer won't connect to server

Hey guys,
I'm currently willing to switch from coinotron to give me coins, since it would let me administrate everything a little better i think. I'm using GUIminer right now, but I'm unable to connect.

I set my reaper miner but it keeps telling me that it is unable to connect to server. 
Did someone else have my problem?
Since I'm trying to learn well to switch to asics in the future I would like to solve this problem.
Thank you in advance
(I'm from eu)
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