Whisperback onion service is unreachable

I cannot send Whisperback reports from Tails. The last report we got was on April 20.

Here's what I get on my computer

% nc -X5 -x 127.0.0.1:9050 -v 5w5qrbg4cufz5w6qhvrdhkgecjlmwj3d7thwelkzau55l2xmrtfbtaid.onion 25
nc: connection failed, SOCKSv5 error: Host unreachable

btw the error that is displayed on Tails is a bit more surprising (PySocks doesn't support IPv6), but maybe that's irrelevant?

image