Hello, I operate three Tor relays on my university's network. All http traffic on that network goes through a transparent proxy which uses the Cisco Senderbase blacklist. I've recently noticed log messages that my relays can't connect to some Tor authorities. Seems like Cisco blacklists the following authorities for serving malware: dizum, tor26, maatuska, urras I've contacted them about this via [1] and explained that these hosts are most likely not malicious and got a replay via e-mail saying that they will remain blacklisted. - Zwiebel [1] http://www.senderbase.org/support/#problem=other