ssh missfire on bpi-m5 noble

[gene1934]

I had to install (they were missing) sshfs, then fuse and finally ssh on a bpi-m5, using a 128Gb u-sd as boot media. iso was noble from a week ago's download, and updated at 2nd boot after establishing my /etc/hosts file based network.  I can ssh from it /to/ the main box w/o any problem. But any attempt to reverse into it /from/ another machine /to/ it is "connection reset by peer". I haven't touched /etc/ssh/*config's from default values. Is there something I need to set/reset in those files to restore incoming logins?  And no, I do not enable root logins. Also, systemd is still a puzzle to me if its involved.

 

Thanks for any advice.

[Werner]

what?

 

armbianmonitor -u