[ILUG] ssh access on Redhat 7.2

[Walter Faleiro]

Hi,
Currently we have a nis server configured with RHEL Update8. There are a few
older clients of Redhat 7.2, with which ssh is having an issue.

I can ssh as root to the system and it connects fine. If I do su - username
after connecting it as root it works fine. The problem is
ssh user at system does not work.
The error log shows
sshd(pam_unix)[3255]: authentication failure; logname= uid=0 euid=0 tty=ssh
ruser= rhost=xxx  user=xxxx

Following are the details of ssh on the Redhat System.

ssh -V
OpenSSH_2.9p2, SSH protocols 1.5/2.0, OpenSSL 0x0090602f
#       $OpenBSD: sshd_config,v 1.38 2001/04/15 21:41:29 deraadt Exp $

# This sshd was compiled with PATH=/usr/bin:/bin:/usr/sbin:/sbin

# This is the sshd server system-wide configuration file.  See sshd(8)
# for more information.

Port 22
#Protocol 2,1
#ListenAddress 0.0.0.0
#ListenAddress ::
HostKey /etc/ssh/ssh_host_key
HostKey /etc/ssh/ssh_host_rsa_key
HostKey /etc/ssh/ssh_host_dsa_key
ServerKeyBits 768
LoginGraceTime 600
KeyRegenerationInterval 3600
PermitRootLogin yes
#
# Don't read ~/.rhosts and ~/.shosts files
IgnoreRhosts yes
# Uncomment if you don't trust ~/.ssh/known_hosts for
RhostsRSAAuthentication
#IgnoreUserKnownHosts yes
StrictModes yes
X11Forwarding yes
X11DisplayOffset 10
PrintMotd yes
#PrintLastLog no
KeepAlive yes

# Logging
SyslogFacility AUTHPRIV
LogLevel INFO
#obsoletes QuietMode and FascistLogging

RhostsAuthentication no
#
# For this to work you will also need host keys in /etc/ssh/ssh_known_hosts
RhostsRSAAuthentication no
# similar for protocol version 2
HostbasedAuthentication no
#
RSAAuthentication yes

# To disable tunneled clear text passwords, change to no here!
PasswordAuthentication yes
PermitEmptyPasswords no

# Uncomment to disable s/key passwords
#ChallengeResponseAuthentication no

# Uncomment to enable PAM keyboard-interactive authentication
# Warning: enabling this may bypass the setting of 'PasswordAuthentication'
#PAMAuthenticationViaKbdInt yes

# To change Kerberos options
#KerberosAuthentication no
#KerberosOrLocalPasswd yes
#AFSTokenPassing no
#KerberosTicketCleanup no

# Kerberos TGT Passing does only work with the AFS kaserver
#KerberosTgtPassing yes

#CheckMail yes
#UseLogin no

#MaxStartups 10:30:60
#Banner /etc/issue.net
#ReverseMappingCheck yes

Subsystem       sftp    /usr/libexec/openssh/sftp-server

 cat /etc/pam.d/sshd
#%PAM-1.0
auth       required     /lib/security/pam_stack.so service=system-auth
auth       required     /lib/security/pam_nologin.so
account    required     /lib/security/pam_stack.so service=system-auth
password   required     /lib/security/pam_stack.so service=system-auth
session    required     /lib/security/pam_stack.so service=system-auth
session    required     /lib/security/pam_limits.so
session    optional     /lib/security/pam_console.so



The issue is only on the Redhat 7.2 systems, and other systems with newer
releases are connecting fine.

 cat /etc/issue
Red Hat Linux release 7.2 (Enigma)
Kernel \r on an \m


Is there any modification needed for older releases to work with newer nis?

Thanks,
--W