Tag: login

Solve the login problem of Webmin in Centos

May 16, 2020 / David Yin / 0 Comments

The problem is I can not sign in the Webmin panel. I did a lot of searches and finally got the solution.

Here is the situation:

Oracle VM Free Tier. I selected the Image: CentOS-7-2020.04.21-0.
For CentOS, SSH public key connection. The user is OPC when I try to ssh to it.
Then I add a new user and add it to the group wheel. the username is admin.
Based on the How To Create a Sudo User on CentOS on DigitalOcean.
I followed the installation guide on the Webmin support page. The ports 10000 to 10010 are opened.
In the browser, I can see the login page. But can not log in with the new user, admin.
Check the error log of webmin at /var/webmin/miniserv.error
The error message is missing Perl module Authen::PAM
Then I install Authen::PAM in the ssh window.
Try to login again. Still can not log in.
I restart the server, and still can not log in.

The real solution is below:

/usr/libexec/webmin/changepass.pl /etc/webmin username password

Replace username by root, and with my own password.

After this command, I can log in the Webmin as root.

See the basic information of this VM.

Features:

AMD EPYC 7551 32-Core Processor, 2 Cores
1GB RAM memory
40GB Storage
CentOS 7.8
Webmin 1.941

Proftpd Login problem with 530 error

June 9, 2014 / David Yin / 0 Comments

I installed a ftp server, Proftp on a developing virtual system. It is on Centos 6 64bit. Install Proftpd with yum command.

When I use ftp client software to connect the ftp server, I got following error.
Response:   220 FTP Server ready.
Command:   USER davidyin
Response:   331 Password required for davidyin
Command:   PASS ******
Response:   530 Login incorrect.
Error:   Critical error
Error:   Could not connect to server

I checked the error log file and saw the following error message.

Jun 09 18:40:34 localhost.localdomain proftpd[5912] 127.0.0.1 (::ffff:192.168.0.102[::ffff:192.168.0.102]): FTP session opened.
Jun 09 18:40:34 localhost.localdomain proftpd[5912] 127.0.0.1 (::ffff:192.168.0.102[::ffff:192.168.0.102]): notice: unable to use '~/' [resolved to '/home/davidyin/']: Permission denied
Jun 10 01:40:34 localhost.localdomain proftpd[5912] 127.0.0.1 (::ffff:192.168.0.102[::ffff:192.168.0.102]): Preparing to chroot to directory '~/'
Jun 10 01:40:34 localhost.localdomain proftpd[5912] 127.0.0.1 (::ffff:192.168.0.102[::ffff:192.168.0.102]): davidyin chdir("/"): No such file or directory
Jun 10 01:40:34 localhost.localdomain proftpd[5912] 127.0.0.1 (::ffff:192.168.0.102[::ffff:192.168.0.102]): FTP session closed.

It is confused me so much and at the last I found the problem.
The reason I get the errors with the home dirs is because of selinux

I have to disable it and everything is OK now.


setenforce 0

Login Directly Into Windows 7 Without Entering Password

January 31, 2014 / David Yin / 0 Comments

Every time Windows 7 is started it asks you to select the username and enter the password to access your system, there is no doubt that it is a very important security measure, but what if you are the only user of your system? In windows 7, you can easily get rid of the login prompt window, go through the following steps to achieve it.

Go to Start and type netplwiz in the Start Search and hit Enter. The User Accounts dialogue box will be displayed as shown in following screenshot.

Now uncheck Users must a enter username and password to use this computer option and press OK. Thats all, now reboot your system and you will never see the login window any more.

Solve the login problem of Webmin in Centos

The real solution is below:

Proftpd Login problem with 530 error

Login Directly Into Windows 7 Without Entering Password

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