Problems with connection / only yellow status

Hi!

I'm using Wuala now for a week. I'm getting the status "Online", no problem, but only the yellow one. Sometimes, very rare, it gets the green one. But that happen maybe two times since i downloaded Wuala.

It's not able to connect with the external IP and if i try to test it, I'm only get this result:

Prürbindung...
Problem: Could not contact ping server A

Port is forwoarded on my router and i'm not using any firewall! Someone may has an idea??

Yours sincerely
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