I ran into following issue: syncing Anki from about > 2.1.30 does not work anymore since adding an individual addon
import anki.sync, anki.hooks, aqt
addr = “http://[…]:27701/” # put your server address here
anki.sync.SYNC_BASE = “%s” + addr
aqt.mw.pm.profile[‘hostNum’] = None
does not change the behaviour of Anki anymore. The server receives no traffic. Anki 2.1.44 does not try to sync with a private server instance anymore but only with ankiweb.net.