"Cannot receive Extensions, why?"


I am new to RapidMiner. Once I try to start updating RapidMiner 5.1.014, it gives following message:
Cannot contact update server http://rapidupdate.de.80/UpdateServer. Please check your Internet Connection.
Please help.
Cannot contact update server http://rapidupdate.de.80/UpdateServer. Please check your Internet Connection.
Please help.
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Answers
Best,
JEdward.