Does /var/log/auth.log get any additional info about the su authentication failure? Seth. I know my password and I am typing it correctly but su indicates authentication failure. Note that the password you will need is your user password, not the root password (Assuming, of course, you have set up sudo and your user is a member of wheel ) 1,955 5 5 gold badges … Help! [regularuser@localhost ~]$ su - switcheduser Password: This is what we see now: su: Authentication failure If we now run the id -Z command again to see the SELinux context for regularuser, we will see the output is quite different from what we saw before: regularuser is now mapped to user_u. I am having problems with the su command. [regularuser@localhost ~]$ id -Z user_u:user_r:user_t:s0 49.3k 40 40 gold badges 137 137 silver badges 191 191 bronze badges. Even now entering the same password on su gives me authentication failure. On my Raspbian distribution the permissions are set slightly differently (and more restrictively). The password is the correct one, I use the same with sudo and works fine. Another possible cause of the “passwd: Authentication token manipulation error” is wrong PAM (Pluggable Authentication Module) settings.This makes the module unable to obtain the new authentication token entered. Hi everyone ... ( Linux Cent OS ) ... only wheel members can become root (wheel) but Unix authenticate non-root applicants. So I checked on the internet and then went into recovery mode and changed my username's password to what I was entering before. From tsearch2 in a Postgres database to ownership of files to the following authentication problem: root@mycomputer:~# su - www-data su: Authentication service cannot retrieve authentication info (Ignored) www-data@mycomputer:~$ Note that with su it ignores the fact. The su command doesn't seem to be working on my fresh Fedora 29 installation. The various settings for PAM are found in /etc/pam.d/. It asks for a password and then it just says: su: Authentication failure. Michael Michael. Since my last upgrade, I had many small things that went awry on my computer. user@host:~$ su Password: su: Authentication failure su. Improve this question. Follow edited Apr 11 '14 at 18:34. Authentication Failed in Linux centos. – circle May 12 '13 at 12:30 You can use sudo su - newuser – Hennes May 12 '13 at 12:33 @Hennes No, not when I'm logged in as usertwo, which does not have sudo rights. Re: su: Authentication failure [Solved] Just as an experiment, what happens if you try sudo su ? 在CentOS中执行SU时，报如下错误： [xxxxxx@centos10 ~]$ su Password: su: Authentication failure 解决方法： 如果确认root没有错误，使用以下方法： 1、登陆root账户； 2、分行sudo -i 3、执行chmod +s /bin/su asked Apr 11 '14 at 18:13. Share. Ubuntu 8.04 Code: chucknb@chucknb-desktop:~ su - Password: su: Authentication failure su - then password, returns authentication failure …
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