SSH login failing on stable/13

bob prohaska <[email protected]>
Newsgroups gmane.os.freebsd.devel.arm
Message-ID <[email protected]>
A Pi3 running stable/13 updated yesterday has stopped accepting ssh logins.
The problem appeared after an update a couple days ago. The update was 
repeated yesterday in hopes of catching some missing details, but no luck.

A session originated from RaspiOS with -vvv ends showing only 
debug3: authmethod_lookup keyboard-interactive
debug3: remaining preferred: password
debug3: authmethod_is_enabled keyboard-interactive
debug1: Next authentication method: keyboard-interactive
debug2: userauth_kbdint
debug3: send packet: type 50
debug2: we sent a keyboard-interactive packet, wait for reply
debug3: receive packet: type 60
debug2: input_userauth_info_req
debug2: input_userauth_info_req: num_prompts 1
Password for [email protected]:
debug3: send packet: type 61
Connection closed by 50.1.20.24 port 22

The "connection closed" took a couple of minutes to appear.
Other ssh connections to older versions of FreeBSD seem to
work normally. I looked at bugzilla, nothing recent about
ssh. 

I'm baffled, any suggestions appreciated!

bob prohaska
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