Debian SID , x86 machine Tor 0.2.3.0-alpha-dev (git-d52a99dc77dc7700) OpenSSL 1.0.0c ( experimental ) libevent 2.0.10 ( experimental ) Self compiled , shared libraries , tor running as a client only. I found this warnings in tor logs : [warn] Rejecting request for anonymous connection to private address [scrubbed] on a TransPort or NATDPort. Possible loop in your NAT rules? [warn] Bug: Duplicate call to connection_mark_for_close at connection.c:1225 (first at connection_edge.c:1680) The first warn is pretty normal because I was running tor as a transparent proxy for a single user on a single machine in my local net and I was connected to it by ssh with X forwarding : of course tor refused to forward X protocol ( indeed , I have a specific iptables rule for permitting that , which I forgot to set in this case) but the call for closing the connection is duplicated/redundant. **Trac**: **Username**: tornewbie