Thanks, it is working now.

Answer changed

I believe it was in two different styles of writing ssh-options I've found. Proably I mixed them.
The contents of the testfile are not important, that were only test without secure data. But thanks for the hint.
Have A Nice Weekend, Thomas

PS:
Now I get a warning in the other Web application, where I wanted to insert the changes made in the old system:

Warning: Identity file $keyfilepath not accessible: No such file or directory.

.. but the files are transfered right and have the right content. Is this able to understand?

In reply to Re^6: Net-SFTP-Foreign: SSH slave exited unexpectedly with error code 255 by toohoo
in thread Net-SFTP-Foreign: SSH slave exited unexpectedly with error code 255 by toohoo

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