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sftp hangs. Node stuck at login prompt

From my logs

Feb 28 03:06:12 bbs synchronet: term Node 2 SSH  bbs.endofthelinebbs.com [192.138.210.158]
Feb 28 03:06:12 bbs synchronet: term Node 2 0038 SSH Setting attribute: SESSINFO_ACTIVE
Feb 28 03:06:15 bbs synchronet: term Node 2 0038 SSH dbg 'No algorithm compatible with the remote system's selection was found: 'ssh-ed25519'' (-50) setting session active
Feb 28 03:06:15 bbs synchronet: term Node 2 SSH login: 'nelgin'
Feb 28 03:06:15 bbs synchronet: term Node 2 <nelgin> 0038 SSH Setting attribute: SESSINFO_AUTHRESPONSE
Feb 28 03:06:15 bbs synchronet: term Node 2 <nelgin> 0038 SSH Setting attribute: SESSINFO_ACTIVE
Feb 28 03:06:15 bbs synchronet: term Node 2 <nelgin> 0038 SSH [192.138.210.158] waiting for channel type.
Feb 28 03:06:15 bbs synchronet: term Node 2 <nelgin> SFTP initialized on channel 1

I tried 3 times connecting from the bbs server

$ node status -vaddr

Synchronet Node Display/Control Utility v3.20

Node  1: User #1 at main menu via ssh (MP) [UQ]
        addr=47.186.62.206
Node  2: At login prompt
        addr=192.138.210.158
Node  3: At login prompt
        addr=192.138.210.158
Node  4: At login prompt
        addr=192.138.210.158
Node  5: Waiting for connection
Node  6: Waiting for connection

and now I have 3 nodes stuck at login prompt and they have been all night, so not timing out.

netstat is showing just the one connection, which is me on node 1.

root@bbs:~# netstat -anp|grep :22
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      1533543/sbbs
tcp        0      0 192.138.210.158:22      47.186.62.206:64636     ESTABLISHED 1533543/sbbs
tcp6       0      0 :::22                   :::*                    LISTEN      1533543/sbbs