Security – Page 2 – POFTUT

Category: Security

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How To Scan Top Ports with Masscan?

masscan is an alternative tool to the popular nmap . Actually masscan provides very less of the nmap but provides some huge adventages. masscan is designed to be fast and performative. nmap have popular feautre named top ports which option is –top-ports to scan specified number of most popular ports. masscan also provides this options too. Nmap Top Ports We will start with scanning top ports in nmap . As stated previously we will use —top-ports option...

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What is Syslog Default Port and Secure Port and How to Configure It?

syslog is a standardized protocol used to send Logs and events to the Log server. syslog can be used in different platforms like Linux, Windows, Unix, Applications etc. In this tutorial we will look the default syslog port and secure syslog port and some examples about how to change this port number. Default Port Number UDP 514 syslog is a protocol which is defined in RFC 5424 and RFC 3164 . The port...

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What Is Default SFTP Port and How To Change SFTP Port Number?

SFTP is a secure version of the FTP. SFTP provides an encrypted channel with the remote server. This makes authentication and data transfer more secure than FTP. SFTP protocol is generally provided by SSH servers by default. In this tutorial, we will learn the default SFTP port and how to change it to a different one. Linux Sftp Command With Examples SFTP Default Port TCP 22 SFTP is a subsystem...

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How To Find And Change SSH Port Number?

ssh  is default protocol used to manage remote systems which are mainly Linux and Network Devices. As it is working over network connection and uses TCP it has a default port number which is 22  . In this tutorial we will look how to change the default port number from client and server point of view. List Server Port Configuration Linux ssh server configuration is stored in /etc/ssh folder with a...

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How to Find Detailed Domain Information with whois Command?

whois  very popular and useful tool used to list and find domain information. We generally know that domain and sub domains are resolved to the IP address and our browser redirects to this IP address. But the actual story is not just this. Domain names have a lot of attributes which is consist of following sections. Registrant Admin Tech Name Server … Install For Ubuntu, Debian, Mint, Kali Now we...

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What Is Nagios?

Nagios is an open source system, network, application monitoring system. Nagios is designed to be run on Linux operating system or distributions like Ubuntu, Debian, CentOS etc. Architecture and Components Nagios is not a single component to run. Nagios is actually a suite which provides following components. Nagios IX Nagios IX is the core of the Nagios suite where it providing core monitoring features. Nagios IX can monitor IT infrastructure...

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What Is OpenSSL Library?

OpenSSL is most popular open source cryptography library which provides a lot of tools, libraries, algorithms about cryptography. It is mostly known with Secure Socket Layers (SSL) and Transport Layer Security (TLS) protocols. Supported Encryption Algorithms Encryption is used to make given data unreadable by the intruders. It is mainly used for confidentiality. OpenSSL supports following algorithms. RSA DSA AES DES 3DES Supported Hash Algorithms Hashing is used to create...

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How To Login To Linux with Passwordless via SSH with Key Based Authentication?

Ssh provides secure remote connections to the remote systems. It is defacto protocol used to manage Linux and networking systems remotely via command line. Ssh provides a lot of extra features which makes it useful for different purposes. For example we can copy files to remote and local system via ssh with a secure manner. In order to make things straightforward we can use passwordless key based authentication for ssh...

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How To Install and Configure Squid Web Proxy Server On Linux?

Corporate generally uses web proxies in order to speed up and secure internet web traffic. There are a lot of paid or open source web proxy applications. Squid is most popular web proxy used by a lot of users. In this tutorial we will look how to install and configure squid proxy. Advantages Of Squid Web Proxy Share internet connection Speed up internet web surfing Control internet web surfing Secure...

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How To Start, Stop and Enable, Disable Iptables or Ufw In Ubuntu, Debian, Kali, Mint

Ubuntu is popular Linux distribution used in different enterprise or personal IT environment. Security is important part of the today IT. We can use firewall services like iptables in order to tighten security of our Ubuntu system. In this tutorial we will look how to install, remove, enable, disable, start and stop Ubuntu iptables. This tutorial can be used for Kali, Debian, Mint distributions too. Ufw or Ubuntu Firewall Ubuntu rebranded...

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