Permission denied for root@localhost for ssh connection

Permission denied for root@localhost for ssh connection Техника

Before I outline the solution to the problem, let’s first discuss why you might want to log in and why you might not.

Тематические термины: SSH, Linux, Ubuntu.

По умолчанию, в некоторых системах Linux (например, Ubuntu) для суперпользователя root вход по SSH с использованием пароля не работает. При попытке подключиться можно увидеть сообщение «access denied» или «permission denied». Такая настройка необходима для обеспечения большей безопасности системе. Однако, если требуется предоставить возможность подключаться по SSH от пользователя root, необходимо выполнить нижеописанное.

* Инструкция подойдет для большинства UNIX-систем.

По сертификату
С использованием пароля

I had a similar problem to this. I needed two PCs, one on Ubuntu and another on Arch, to sync files through Unison but ran into the same permission denied error. Just for the sake of those who are having the same problem as I was, here’s what I did:

First: Installed the same version of Unison on both PCs. This was a bit challenging as the one available on the software center was behind to what was readily available for Arch. So, I couldn’t find a higher version for Ubuntu, so I replaced the one on Arch with a lower one instead. Found one here: http://zdia.de/downloads/unison-2.40.102-linux-x86_64. The same version is in the software center for Ubuntu.

After applying it, I could now login via SSH to server 2.

So I ran Unison, and corrected the profile settings, and viola!

This “access denied” error is one of the most common errors you’ll get when working with MySQL.

Learn how to fix it, and see a range of solutions if the suggested fix does not work, in this article.

When you try to connect to a MySQL database on your own computer (called “localhost”), you may get this error:

You might get an error code in front of it:

You might also get the error with “using password no”:

You’ll see this if you log into MySQL using the command line:

mysql -u root -p

What does this mean? How can you fix it?

There are a few solutions to this, which I’ve detailed below. Try one, and if it doesn’t work, try another one.

Also a tip for logging in: don’t enter your password in the command line itself, because this will be stored in your command history. Use the -p option, as mentioned above, and then you’ll be prompted to enter the password.

Sudo then Change Password

If you get the “access denied” error, one way to solve it is by using sudo to log in to mysql and change the root password.

Step 1: Open the command line on your system.

Step 2: Open mysql using the sudo command:

Step 3: Enter the password for this account.

Step 4: Change the auth_plugin to mysql_native_password, and the password for the root account, in a single command:

Substitute the word your_new_password with a new secure password that you want to use for the root account.

The mysql_native_password method is a traditional method of authentication and will allow you to login.

Step 5: Flush the privileges, which tells the server to refresh the grant tables and apply your changes, with this command:

Step 7: Exit the console by pressing CTRL + D or typing exit.

Step 8: Log in to mysql using the root account and the new password you set, which should work:

You should now be logged in to the root account in mysql.

If the above solution did not work, you may need to edit the mysql.cnf file to allow for changes to the root account.

Step 1: Open the my.cnf file. This may be stored in:

If you’re not sure where it is, search your MySQL installation folder (e.g. on Windows or Mac) for the file.

If you don’t have a my.cnf file (MacOS does not include one by default). You can create one in the /etc folder if you like.

Step 3: Restart the MySQL server.

Step 4: Login to the root account:

Step 6: Set a new password for the account:

Step 7: Open the my.cnf file you opened in step 1, and remove the line about skip-grant-tables, and save the file.

Step 8: Restart the MySQL server again.

Step 9: Log in to the root account again:

You should now be able to log in successfully with your new password and not get an error.

Conclusion

If you have any questions, feel free to use the comments section below.

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Best Python code snippet using slash

2## Printing troubleshooter6## This program is free software; you can redistribute it and/or modify8## the Free Software Foundation; either version 2 of the License, or9## (at your option) any later version.10## This program is distributed in the hope that it will be useful,11## but WITHOUT ANY WARRANTY; without even the implied warranty of12## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the14## You should have received a copy of the GNU General Public License15## along with this program; if not, write to the Free Software16## Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.17from gi.repository import Gtk23from timedops import TimedSubprocess, TimedOperation24from .base import *262830 def __init__ (self, troubleshooter):31 Question.__init__ (self, troubleshooter, «Check network server sanity»)32 troubleshooter.new_page (Gtk.Label (), self)33 def display (self):34 # Collect useful information.36 answers = self.troubleshooter.answers37 if (‘remote_server_name’ not in answers and38 ‘remote_server_ip_address’ not in answers):3940 parent = self.troubleshooter.get_window ()42 server_port = answers.get(‘remote_server_port’, 631)43 try_connect4445 # Try resolving the hostname.4647 ai = socket.getaddrinfo (server_name, server_port)50 try_connect5152 resolves = False54 ipaddr = answers.get (‘remote_server_ip_address’, »)555657585960 # The IP address given doesn’t match the server name.61 # Use the IP address instead of the name.62 server_name = ipaddr63 try_connect6465 server_name = ipaddr66 try_connect6769 # Validate it.7071 ai = socket.getaddrinfo (server_name, server_port)7475 resolves = False77 try_connect79try_connect8183 if answers.get (‘cups_device_uri_scheme’) == ‘https’:84 encryption = cups.HTTP_ENCRYPT_REQUIRED8586 encryption = cups.HTTP_ENCRYPT_IF_REQUESTED8788 self.op = TimedOperation (cups.Connection,90919293 c = self.op.run ()94 ipp_connect = True9596 ipp_connect = False9899100 self.op = TimedOperation (c.getPrinters, parent=parent)101102 cups_server = True103104 cups_server = False106108 uri = cups_printer_dict.get (‘device-uri’, None)109110111 self.op = TimedOperation (c.getPrinterAttributes,113114 attr = self.op.run ()116117118119 # Try to see if we can connect using smbc.120 context = None121122 context = smbc.Context ()124 self.op = TimedOperation (context.opendir,125 args=(«smb://%s/» % name,),126127 dir = self.op.run ()128 self.op = TimedOperation (dir.getdents, parent=parent)132133 # No smbc support134135 except RuntimeError as e:136 (e, s) = e.args138 if context is not None and ‘cups_printer_dict’ in answers:140 u = smburi.SMBURI (uri)142 accessible = False143144 self.op = TimedOperation (context.open,145 args=(«smb://%s/%s» % (host,147148149150 f = self.op.run ()151 accessible = True152 except RuntimeError as e:153 (e, s) = e.args154 accessible = (e, s)156 # Try traceroute if we haven’t already.157try_connect158 ‘remote_server_traceroute’ not in answers):159160 self.op = TimedSubprocess (parent=parent, close_fds=True,163164165167168 # Problem executing command.169170171 def collect_answer (self):172173 def cancel_operation (self):

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17 for x in range(width):1920try_connect(here, x, y):21 if (0 <= x < width) and (0 <= y < height): # in bounds26# hook up neighbors27for y in range(height):28 for x in range(width):30 try_connect(here, x, y-1)31 try_connect(here, x, y+1)32 try_connect(here, x-1, y)33 try_connect(here, x+1, y)34# find start and end nodes36for y in range(height):37 for x in range(width):40 start = here44 end = here45# # print graph46# for row in graph:47# for col in row:

1″»» engines/engine «»»4from vmwareweb.engines.authentications import SSHClient, ssh_cli5from vmwareweb.engines.response_collections import host_cmd_vmid, host_vrt, collection, initialization, vrt_unreachable6from vmwareweb import app7from vmwareweb.engines.send_email import alert, successful_autostart, bad_autostart12yaml_dir = os.path.abspath(os.path.dirname(__file__))13stream = open(os.path.join(yaml_dir, ‘mp.yaml’))14mp = yaml.load(stream, Loader=yaml.FullLoader)2122 This function is listen IPs and will be check availability servers if server down then23 will be initialization response to auto start copy VM on other host and will be call SSH Client function2426 try_connect27282930 for vrt, host in host_vrt.items():32 if answer != 0:333435 try_connect37try_connect38394041try_connect42 for vm, cmd in host_cmd_vmid.items():43 if vm == vrt:45 try_connect464748495253

Why you should login as root

I know at least one scenario where you need to log in as root because sudo is not an option. The keyword is SFTP. If you remotely manage a Linux machine, you will often want to use SFTP to edit system configuration files or system scripts which requires root permissions.

Of course, you can also login via SSH and then edit the files with sudo. However, editing large scripts with an editor such as nano is not really fun. It is much more convenient and efficient if you can work with your favorite GUI editor on your local machine.

Some SFTP clients like WinSCP allow you to send a sudo su after login, but many popular tools, such as Transmit for macOS, don’t offer this option.

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If you want to remotely edit system files in such cases, you have two options for EC2 instances.

Create a second root user

Система настроена таким образом, чтобы можно было подключиться под пользователем root с использованием сертификата. Рассмотрим, как это сделать.

На любом компьютере с Linux сгенерируем пару ключей командой:

В домашней директории:

ls -l ~/.ssh/

Идем на наш целевой компьютер Ubuntu. Создаем каталог:

Вставляем в него содержимое файла id_ed25519.pub.

Теперь с компьютера, где были созданы сертификаты можно зайти на компьютер с Ubuntu:

Теперь с использованием ключа из файла id_ed25519 можно подключиться к нашему компьютеру Ubuntu без пароля.

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Для начала, необходимо создать пароль пользователю root следующей командой:

После нажатия Enter вводим дважды пароль.

Теперь открываем настройки SSH:

и редактируем параметр PermitRootLogin — задаем значение yes:

Перезапускаем ssh server:

или в старых версиях без systemd:

Permission denied for root@localhost for ssh connection

Была ли полезна вам эта инструкция?

Enable root login on EC2 instances

The first option is simply to edit the authorized_keys file in /root/.ssh/. All you have to do is remove this text:

It probably makes sense to leave the beginning of authorized_keys: «no-port-forwarding,no-agent-forwarding,no-X11-forwarding.»

Permission denied for root@localhost for ssh connection

Enable root login on an EC2 instance

Also, notice that whenever you create an AMI from this instance and then launch a new instance, AWS will modify the authorized_keys file, and you will have to remove the text above again.

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