ssh & ssh-agent conflict

[Bjarne D Mathiesen]

Recently, I've gotten the exact same problem as described here :

https://apple.stackexchange.com/questions/277479/openssh-hangs-at-rekey-after-134217728-blocks
https://itectec.com/askdifferent/openssh-hangs-at-rekey-after-134217728-blocks/

and the work-around of setting
    SSH_AUTH_SOCK='ssh git at github.com'
works as described

BUT I'm at a loss as to which process messes ssh up :-(
I don't have any running ssh-agent.plist anywhere

I'm having this problem on both of my
    macmini1,1 10.6.8
    macmini2,1 10.6.8
but not my
    MacPro5,1

They've all got
    openssh @8.8p1_2+kerberos5+xauth

Any ideas as to how I can trouble-shoot this further ???

thanks,
-- 
Bjarne D Mathiesen
Korsør ; Danmark ; Europa
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denne besked er skrevet i et totalt M$-frit miljø
MacPro 2010 ; OpenCore + macOS 10.15.7 Catalina
2 x 3,46 GHz 6-Core Intel Xeon ; 256 GB 1333 MHz DDR3 ECC RDIMM
ATI Radeon RX 590 8 GB