Just a hint:
If you gave a user/pw to your Twonky server and forgot these access data you can do the following:
stop Twonky server by the NAS webinterface
log on you NAS with Putty
go to direktory /share/1000/twonkymedia/var/twonkymedia/
1. rename twonkymedia-server.ini into twonkymedia-server.old (then your Twonky is like a new Twonky, all settings have to be made)
2. delete the PW in twonkymedia-server.ini by editing the file
Exit Putty
Start the Twonky Server