Dear all, Previously, I've run arm using 'sudo -u debian-tor arm'. As was mentioned here previously, this is not how you should run it - in fact there is a bit of documentation to suggest how it should be done. Unfortunately I'm having some issues getting arm working correctly as described here in step 14: https://www.torproject.org/docs/tor-relay-debian.html.en#after Having added my user (pi) to the debian-tor group, I try to run 'arm' and get the following: Failed to read authentication cookie (permission denied): /var/run/tor/control.authcookie I've tried reinstalling arm, relogged and checked that I'm in the right group still using 'groups' (which I am) - no joy. I've checked my torrc and found the following lines: ## If you enable the controlport, be sure to enable one of these ## authentication methods, to prevent attackers from accessing it. #HashedControlPassword 16:872860B76453A77D60CA2BB8C1A7042072093276A3D701AD684053EC4C #CookieAuthentication 1 CookieAuthentication wasn't initially enabled, turning it on makes no difference, I get the same error. I am able to get it working when setting up HashedControlPassword by generating a has using tor --hash-password <password> and editing torrc accordingly. Am I missing something when it comes to setting up CookieAuthentication? I guess I must be...although it seems strange that I was getting that error even with CookieAuthentication disabled. Any insight appreciated :) Chris -- *Dr Chris Whittleston 栗主* Department of Chemistry University of Cambridge Lensfield Road, Cambridge, CB2 1EW Email: csw34@cam.ac.uk Tel: +44 (0)1223 336423