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To change your port, open your /etc/ssh/sshd_config file and add the following lines: #Run SSH on a non standard port A lot of people might choose to use 222 or 2222 as their port since itвЂ™s pretty easy to remember, but for that very reason, hackers scanning port 22 will likely also be trying ports 2.В Try and select a port number that is not already used, follow this link for a list of port numbers and their known services. You can choose any unused port as long as itвЂ™s not used by another service. If itвЂ™s harder to scan for your SSH server, then your chances of being attacked are reduced.

The vast majority of hackers looking for any open SSH servers will look for port 22, since by default, SSH listens for incoming connections on that port. One of the main benefits of changing the port and using a non-standard port is to avoid being seen by casual scans. Then restart your SSHD service by entering one of the following commands to apply the changes: /etc/init.d/sshd restart or service sshd restart 7. The final line should look like this: Protocol 2 Remove the 1, then uncomment it (remove the #). Open your /etc/ssh/sshd_config file and look for the following line: #Protocol 2, 1 If you are looking for your server to become PCI compliant, then you must disable protocol 1. Protocol 2 is what you should be using to harden your security. If you then need to access root, simply log in as a normal user and use the su command. You are now safe from brute force root login. Then restart your SSHD service by entering one of the following commands: /etc/init.d/sshd restart or service sshd restart Remove the # for the changes to take effect.

The # symbol (comment) tells the server to ignore anything after it on the same line. To disable logging in through SSH as root, change the line to this: Open that file while logging on as root and find the section in the file containing #PermitRootLogin in it. All your SSH server settings are stored in the /etc/ssh/sshd_config file. To disable your Root Logins, youвЂ™ll need to edit the SSHD configuration file.

#Brute force port 22 scp password

By doing so, any hackers attempting brute force on your root password could hypothetically access your system and if you think about it, root can do a lot more damage on a machine than a standard user can do. One of the most dangerous security holes you can have in your system is to allow direct logging in to root through SSH. Then restart your SSHD service by entering one of the following commands: /etc/init.d/sshd restart or service sshd restart 5. Open your /etc/ssh/sshd_config file to add an вЂAllowUsersвЂ™ line, followed by the list of usernames, and separate them with a space: AllowUsers user1 user2 This way, you will minimize the impact of having a user with a weak password. To provide another layer of security, you should limit your SSH logins to only certain users who need remote access.

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Open your /etc/ssh/sshd_config file and update the following line: PermitEmptyPasswords no 4.

You need to prevent remote logins from accounts with empty passwords for added security. Once the interval has passed, the idle user will be automatically logged out. The idle timeout interval you are setting is in seconds (360 secs = 6 minutes). Open your /etc/ssh/sshd_config file and add the following line: ClientAliveInterval 360 To avoid having an unattended SSH session, you can set an Idle timeout interval.

#Brute force port 22 scp generator

A strong password will help win the fight against an attack! Use RDM Password Generator to generate strong and random passwords and use our list of Forbidden Passwords to prevent anyone from using 123456 or other such nonsense. A hacker will usually try to scan for port 22 (default port) to discover machines running SSH they will then try a heavy-handed attack against it. If you have SSH running and exposed to the outside world you will probably notice some log attempts made by hackers that are trying to guess your username and password.

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Here is our top 10 list for how to secure your Open SSH: 1. When running an SSH server, there are a few easy steps that will considerably increase the installationвЂ™s level of security. Still, using the default installation for SSH can have its own downfalls when it comes to security. It has made other protocols such as Telnet unnecessary since SSH encrypts your connection and passwords are no longer sent in plain text. When talking about remote access standard, Open SSH has become the norm.

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Well we might as well call this month our SSH month since we are full throttle on SSH! Following our вЂњ Reverse SSH Port ForwardingвЂќ and вЂњ How to Configure SSH Tunnel on PuttyвЂќ, we thought it would be good to look at securing Open SSH, since security is RDMвЂ™s number one priority!