If bridge authority is unreachable, client doesn't fallback to bridge

When a Tor client starts up using a bridge, and UpdateBridgesFromAuthority is set (which it is when Vidalia configures you to use a bridge), Tor will go to the authority first and look up the bridge by fingerprint.

If the bridge authority doesn't have the bridge, or Tor doesn't know the fingerprint, then Tor will fall back to asking the bridge directly.

If the bridge authority is filtered, though, then Tor will never notice that the bridge authority lookup failed. So it will never fall back. Fail.

Our workaround for now is to stop giving out fingerprints via bridgedb.

[Automatically added by flyspray2trac: Operating System: All]