Maybe I’m blind… but wherer is the portal check-box? I can’t find it… 
I work in Blender 2.79
Thanks for your help
Its in Lamp/Area :

Good luck 
I was in Blender Render… the whoooole time…
I didn’t switch it after making a new blendfile…
Sorry for bothering you 
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No worries, I’m glad you found it 
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