Good morning,
I GOT IT. I can't explain but it is perhaps because of my router.
I have a D-Link router in my home network. You can define a privat port (80, 8080, 21... for the different protocols) and a public port which can be seen from the net. For FTP my privat port was 21 of course and i choose 1952 as for the public one. Now i change the ports back, i.e. i defined public=privat=21. On this way it works. Maybe my chosen port number 1952 was somehow not acceptible for the router. However i am now satisfied (altough only 99%), and thanks again for your help anyway.
Best regards
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