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If you set up a bridge with

bridgerelay 1
orport 9509 noadvertise

and then have somebody try to reach it with a client (usebridges 1 bridge x.y.z.a:9509).

The result is that the client will stop bootstrapping at

Jul 31 16:06:09.990 [notice] Bootstrapped 50%: Loading relay descriptors.
Jul 31 16:06:10.752 [notice] no known bridge descriptors running yet; stalling

What's happening is the client is asking for /tor/server/authority.z, and on the bridge side, directory_handle_command_get() calls dirserv_get_routerdesc_fingerprints() which calls router_get_my_routerinfo() which returns NULL.

I assume that's because router_rebuild_descriptor() calls router_get_advertised_or_port() which calls get_first_advertised_port_by_type_af() which checks !cfg->no_advertise and ends up returning 0.