Re: ssh issue that I don't understand

On lun., 2026-07-06 at 08:53 +0100, Chris Green wrote:
> Joe <[email protected]> wrote:
> > On Sun, 5 Jul 2026 20:19:12 +0100
> > Chris Green <[email protected]> wrote:
> > 
> > > This isn't a problem as such but I don't understand why it's
> > > happening
> > > and I'd like to understand.
> > > 
> > > I have a VPS called isbd.biz and I access it using ssh.  My user
> > > account on both my local machine (desktop and laptop) is 'chris'
> > > and
> > > my user account on isbd.biz is also 'chris'.
> > > 
> > > I have account 'chris' on isbd.biz set up to allow login only
> > > using
> > > public key authentication.
> > > 
> > > The ip address of isbd.biz is 213.171.194.64.
> > > 
> > > If I log in with 'ssh 213.171.194.64' I, correctly, get prompted
> > > for
> > > my local system's public key passphrase and I can log in
> > > successfully.
> > > 
> > > However if I try 'ssh isbd.biz' I get prompted for
> > > "[email protected]'s
> > > password" which doesn't exist and I can't log in.
> > > 
> > > 'host isbd.biz' returns the correct IP address for isbd.biz so
> > > why
> > > does ssh not work using the name rather than the IP address?
> > > 
> > 
> > Could the issue be that technically isbd.biz is a domain name and
> > not a
> > hostname? That ssh is trying to log you into a network account
> > rather
> > than a particular computer, and is using the only name it knows you
> > by?
> > 
> It's a single host at that address/domain. As I said it's a VPS and
> the isbd.biz domain is mine and has A and AAAA records pointing
> solely
> at the VPS.

may be you add ipv6 in A records

> 
> As pointed out elsewhere the issue is caused by isbd.biz having an
> IPV6 address as well as an IPV4 one.