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I have transmission-deamon running and it's giving me the error Permission Denied: /mnt/RyNet/Downloads/the-torrent/some-file.ext

So it cannot write files to the download directory:

ryguy@MPU /mnt/RyNet $ id debian-transmission
uid=120(debian-transmission) gid=132(debian-transmission) groups=132(debian-transmission),117(sambashare)
ryguy@MPU /mnt/RyNet $ ps aux | grep transmis
120      16184  0.2  0.3  57724 12644 ?        Ssl  22:17   0:11 /usr/bin/transmission-daemon -f --config-dir /var/lib/transmission-daemon/info
ryguy@MPU /mnt/RyNet $ ls -alh
total 100K
drwxrwx--- 16 root  sambashare 4.0K Apr 15 21:36 .
drwxr-xr-x  5 root  root       4.0K Dec  4 08:20 ..
drwxrwxrwx  4 root  sambashare 4.0K Apr 20 05:30 Downloads

But, I have the download directory permissions set to 777, owned by group sambashare.
The transmission-deamon is running as debian-transmission user/group and the debian-transmission user is in group sambashare.

Even stranger, when I set the debian-transmission user's shell to /bin/bash and login via su, I can easily issue commands such as touch /mnt/RyNet/Downloads/testfile with no errors and it creates the testfile just fine.

So, why can't transmission-deamon write files to the download directory?

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Aha! The transmission-deamon was in group sambashare but was not it's main group.

Issuing sudo usermod -g sambashare debian-transmission solved my problem.

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