pam_unix(webmin:auth): authentication failure

[Jean-christophe Manciot]

I've just changed webmin SSL private key and certificate.
Now, I get this error message:

systemctl status webmin
● webmin.service - LSB: Start or stop the Webmin server
   Loaded: loaded (/etc/init.d/webmin)
   Active: active (running) since Thu 2016-01-28 14:59:52 CET; 28min ago
     Docs: man:systemd-sysv-generator(8)
  Process: 1075 ExecStart=/etc/init.d/webmin start (code=exited, status=0/SUCCESS)
   Memory: 39.1M
      CPU: 2.483s
   CGroup: /system.slice/webmin.service
           └─3792 /usr/bin/perl /usr/share/webmin/miniserv.pl /etc/webmin/miniserv.conf

Jan 28 14:59:42 samsung-ubuntu systemd[1]: Starting LSB: Start or stop the Webmin server...
Jan 28 14:59:44 samsung-ubuntu perl[1076]: pam_unix(webmin:auth): authentication failure; logname= uid=0 euid=0 tty= ruser= rhost=  user=root
Jan 28 14:59:46 samsung-ubuntu webmin[1076]: Webmin starting
Jan 28 14:59:52 samsung-ubuntu systemd[1]: Started LSB: Start or stop the Webmin server.

What should be done to allow access through PAM again?

[Gary Johnson]

I have an issue with the same symptons.
Installed on Ubuntu 18.04 with instructions from here: http://www.webmin.com/deb.html

From log
Mar 24 08:01:32 cloudb-2019 systemd[1]: Starting LSB: web-based administration interface for Unix systems...
Mar 24 08:01:34 cloudb-2019 perl[957]: pam_unix(webmin:auth): authentication failure; logname= uid=0 euid=0 tty= ruser=
Mar 24 08:01:35 cloudb-2019 webmin[957]: Webmin starting
Mar 24 08:01:36 cloudb-2019 systemd[1]: Started LSB: web-based administration interface for Unix systems.

It says its started, but I time out every time I try and access it, I time out

It says its running: /etc/init.d/webmin status
Webmin (pid 2550) is running

I do not see a log for webmin under /log/var

I have the key for webmin
apt-key list
/etc/apt/trusted.gpg
pub dsa1024 2002-02-28 [SCA]

uid [ unknown] Jamie Cameron jcameron@webmin.com
sub elg1024 2002-02-28 [E]
its not expired

I have searched for authentication failure

https://sourceforge.net/p/webadmin/discussion/600155/thread/39cc95c4/?limit=25#8c88/7731

How do I Enable Session authentication?
I even found the reason for the failure of the authentication page.
In the configuration of Webmin , the Authentication module, had not enabled the " Enable session authentication ." After enabling this option, the login screen was changed and returned to work normally.

Mar 24 09:19:43 cloudb-2019 sshd[5311]: PAM 2 more authentication failures; logname= uid=0 euid=0 tty=ssh ruser= rhost=61.177.172.157 user=root
Mar 24 09:20:41 cloudb-2019 sshd[5335]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=61.177.172.157 user=root