OpenSSH_6.7p1 hostbased authentication failing on linux->linux connection. what's wrong with my config?

[grantksupport at operamail.com]

On Fri, Jan 9, 2015, at 02:26 PM, Iain Morgan wrote:
> > 	server
> > 
> > 		ls -al /usr/local/libexec/ssh-keysign
> > 			-rwsr-xr-x+ 1 root root 455K Oct 11 06:51 /usr/local/libexec/ssh-keysign*
> > 
> > 		ls -al /usr/local/etc/ssh/ssh.server.ed25519*
> > 			-rw-------+ 1 root root 464 May 10  2014 /usr/local/etc/ssh/ssh.server.ed25519
> > 			-rw-r--r--+ 1 root root 107 May 10  2014 /usr/local/etc/ssh/ssh.server.ed25519.pub
> > 
> 
> Renaming the keys in your output only serves to complicate matters for
> those who are taking time to try to help you.

How so?  What's being complicated?  I haven't renamed anything "in my output".

Those are the actual keynames, and locations, that I've been using for years, renewed, as you can see by the date, just last May