Running 15.0 on a Toshiba Lenovo T430 (hostname: caddis) and trying to ssh to the desktop server/workstation (hostname: salmo; running 14.2). I am having difficulty learning why they won't communicate. I use a high-number port (redacted here); here is the output of running the command ssh -vv salmo after providing my salmo password:

debug1: Authenticator provider $SSH_SK_PROVIDER did not resolve: disabling
debug2: resolving "salmo" port nnnnn
ssh: Could not resolve hostname salmo: Temporary failure in name resolution.

In salmo's /etc/hosts there is:
192.168.55.1 salmo, salmo.appl-ecosys.com

Any idea what I've done wrong?

TIA,

Rich

I assume you mixed up your information when sharing with us. That entry for /etc/hosts should be on caddis, not just on salmo.
Also, you cannot have provided your salmo password unless you already had a ssh connection between the two hosts. So either you are making this up or you are really confused.
Furthermore, get rid of that comma behind "salmo", it has no place in a hosts file. See "man hosts".

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If you want to use names instead of IP addresses, you need to either have a DNS server within your LAN or add the names and corresponding IP addresses to /etc/hosts on whichever client machine you're using.

eg: On your laptop, you need to put this into /etc/hosts:
For more information:

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The /etc/hosts file is the same on both hosts.

Both hosts can ping each other.

From salmo I can ssh into caddis and the shell prompt shows 'caddis' as the host.

When I try to ssh from caddis to salmo, after entering my password the shell prompt shows 'caddis' as the host, not 'salmo.' And `ls` shows the contents of ~/ on caddis.

Did you fix your /etc/hosts entries, removing the comma that does not belong? I guess not.
You get a password prompt which means the two computers talk to each other, but in the end ssh fails to log you in because of that DNS resolving error. Do you have an old entry for salmo (with the wrong IP address) in your ~/.ssh/config file perhaps?

Could it be that you are connecting from caddis to the caddis itself?

It doesn't need to be.
Using IP addresses, or names?
So the process is failing.

Have you taken the suggestion above and removed the comma from your /etc/hosts file?

Please show us the output from the following commands on host caddis:

regards Henrik