Re: [PLUG] Puzzling openssh problem

[Thomas Delrue via plug <plug@lists.phillylinux.org>]

Any 127.0.0.0/8 address is a loopback address
https://en.wikipedia.org/wiki/Reserved_IP_addresses

You don't need an entry in your hosts file for it to go to your localhost...

Try this (or any variant of 127.0.0.0/8):

$ ping 127.123.234.12

It's actually a very useful mechanism because it lets you bind services
to specific addresses (think Postgres' listen_address).

On 7/24/20 10:13 AM, Michael Lazin via plug wrote:
> I was curious about 127.0.1.1 and so I looked it up and that address
> exists as localhost on debian systems only. 
> See https://serverfault.com/questions/363095/why-does-my-hostname-appear-with-the-address-127-0-1-1-rather-than-127-0-0-1-in
> 
> I have two possible suggestions which may get you moving in the right
> direction.  One is try this again and then look at your syslog.  The
> other is to set the flag for verbose ssh.  I am on my phone right now so
> I am working from memory but I believe you want ssh -vv but you might
> want to check the man page because it has been a long time since I have
> used verbose ssh to troubleshoot an issue and I am going from memory.  I
> hope that this helps.   Thanks,
> 
> On Thu, Jul 23, 2020, 5:26 PM K.S. Bhaskar via plug
> <plug@lists.phillylinux.org <mailto:plug@lists.phillylinux.org>> wrote:
> 
>     On a Debian Stable system, I installed (via pinning) golang and
>     clang from Testing which together brought in a bunch of new
>     packages. I have a really puzzling problem now in that ssh localhost
>     does not work (it says Connection closed by 127.0.1.1 port 22), but
>     telnet localhost 22 says:
> 
>     Trying ::1...
>     Connected to localhost.
>     Escape character is '^]'
>     SSH-2.0-OpenSSH_7.9p1 Debian-10+deb10u2
> 
>     (and after a while, the daemon closes the connection)
> 
>     Any ideas as to what could be wrong? I am not even sure where to
>     look. Thank you.

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