Cannot connect to photon cloud

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Hello!!
I just installed photon in Unity. I created an app type "PUN" and I pasted the ID in the setup PUN wizard. The server settings are on "Photon Cloud" with EU region. When I launch the photon demo on PUN basics-Launcher it never connects to the cloud and shows error "Disconnected" after a lot of infos like "Resending: CMD(2 ch#/sq#/usq#......."
Can someone help? I'm king of a noob in networking and I'm really stuck.