On 2018-12-04 16:33:33, tschador@posteo.de wrote:

Furthermore it was clear for me that fix periods of 21 min 21 sec couldn't be a normal client. Missing more information about bridge directory authority …

From https://blog.torproject.org/new-bridge-authority: "The Bridge Authority is a simple but essential piece of the Tor Network. Unlike the other directory authorities, the Bridge Authority does not get a vote in Tor's consensus protocol. Instead, it serves to aggregate relay descriptors which Tor Bridges send to it, checking their cryptographic validity and testing that the Bridges' ORPorts within these descriptors are reachable"

The last part is what causes the connections you see