On 03/12/2018 17:30, Rick Stevens wrote:
On 12/3/18 8:15 AM, John Pilkington wrote:
Hi: I have two boxes connected to the same router. One runs SL7.5,
from tomorrow probably SL7.6, which is an el7 clone, and the other runs
Fedora 28.
I can ssh and rsync from F28 to SL7, but permission is denied in the
opposite direction. Port 22 is open. I now have copies of both
versions of /etc/sshd and intend to examine diffs.
Google provides many links but nothing that looks authoritative or,
preferably, authoritative and simple. Any help wpuld be appreciated.
You need to look at the logs or messages when you try to connect from
SL7 to F28 (and F29 is current).
Odds are that SL7 is using a cipher or an algorithm that is deemed
insecure in the latest sshd implementations at the F28 end and you'll
either need to have sshd on F28 accept it (via a "Ciphers" or
"KexAlgorithms" option in /etc/ssh/sshd_config) or use one of the
acceptable ciphers/algorithms at the client (SL7) end.
Logs and error messages are your friends in these cases.
Thanks Rick. The SL7.5 to 7.6 upgrade has just completed but
'Connection refused' still. The only effective diffs between the
sshd_configs appeared to be in F28, 'PermitRootLogin yes' and 'PrintMotd
no'. So I'll try to get some more verbose logs.
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