On 4 Mar 2018, at 17:50, peter.zehetner@liwest.at wrote:

OK, but what is this:
Mar 03 21:36:31.000 [warn] Failed to start child process "tor-fw-helper" in state 9: No such file or directory
Mar 03 21:51:46.000 [warn] Failed to start child process "tor-fw-helper" in state 9: No such file or directory
Mar 03 21:56:51.000 [warn] Failed to start child process "tor-fw-helper" in state 9: No such file or directory

Remove the PortForwarding* options from your torrc.

You don't need them, because your ports are reachable.

Tor is now online for about 36 hours, the log says 6 hours because the computer was restarted.
This is the latest log:
…
How long does it last until the relay will be in use?

https://blog.torproject.org/lifecycle-new-relay

What do the "flags" in tor-arm mean? Sometimes it says "Running, V2Dir, Valid"

https://metrics.torproject.org/glossary.html#relay-flag