Having seen apt-cacher-ng decide to download files, Debug 3 isn't going to help - it doesn't identify the IP address it's fetching from. What does seem to be suspicious though is that there is one "started" line and three "finished" lines.
1787313164|M|Download of secdeb/dists/trixie-security/InRelease started 1787313164|M|Download of secdeb/dists/trixie-security/InRelease finished 1787313164|M|Download of secdeb/dists/trixie-security/InRelease finished 1787313164|M|Download of secdeb/dists/trixie-security/InRelease finished and for trixie-backports, it's a similar story: 1787313164|M|Download of debrep/dists/trixie-backports/InRelease started 1787313164|M|Download of debrep/dists/trixie-backports/InRelease finished 1787313164|M|Download of debrep/dists/trixie-backports/InRelease finished 1787313164|M|Download of debrep/dists/trixie-backports/InRelease finished Nothing else in the log files seem to relate to these downloads. apt-cacher.dbg and apt-cacher.err are empty.
