Linux, Windows, Security, Programming, Network Tutorials
Common Name or CN is generally used in SSL Certificates. CN is used to define the server name which will be used for secure SSL connection. Generally this SSL certificate used to secure connection between a HTTP/S server and client browser like Chrome, Explorer, Firefox. Common Name (CN) Common Name is used to specify the … Read more
Hypertext Transfer Protocol or HTTP 503 Service Unavaiable server error response code indicates that the server is not ready to handle the request. Also HTTPS protocol will use the same code for the same reason. In this tutorial we will examine the 503 error code causes, client and server side solutions. 503 Expressions HTTP 503 … Read more
Http is popular protocol used to transfer web page data like HTML, Javascript, Image etc. HTTP is used between our browser like Chrome, Firefox, Edge, Internet Explorer and server like Apache, Nginx etc. HTTPS is secure version of HTTP and recently sites transition to the HTTPS. But what is a user try to access HTTP … Read more
Nginx web server provides a lot of different configuration about the web service. Some of the configurations are used very often. server_nameis one of them which can be miss interpreted. Single Domain Name In the old days internet was so little. There was less site and domain names than today. System administrators were prefer to … Read more
Lftp is a powerful command line tool which supports FTP, HTTP, SFTP, FISH, TORRENT protocols for file and data transfer. As we can see it supports popular data and file transfer protocols. It uses GNU TLS or OpenSSL for SSL/TLS encryption. In this tutorial we will look installing and different examples with lftp . Install lftp … Read more
curl is a useful tool used to create HTTP, HTTPS, FTP, … and similar protocol requests from the command line. This provides us the ability to simulate web browser behavior or similar application logic without a GUI. In this tutorial, we will look at different use cases for curl POST and JSON. For more information about curl can … Read more
Tcpdump is everyday tool used by system and network administrator. We generally look simple use cases like host, port and protocol filter for tcpdump . In this tutorial we will look how to filter host, port and protocol in tcpdump. But keep in mind that tcpdump will requires administrator or root privileges. We can use root account … Read more
OpenSSL provides read different type of certificate and encoding formats. OpenSSL supports certificate formats like RSA, X509, PCKS12 etc. We will look how to read these certificate formats with OpenSSL. Read RSA Private Key RSA is popular format use to create asymmetric key pairs those named public and private key. We can use rsa verb to … Read more
OpenSSL provides different features and tools for SSL/TLS related operations. s_lient is a tool used to connect, check, list HTTPS, TLS/SSL related information. Simply we can check remote TLS/SSL connection with s_client . In these tutorials, we will look at different use cases of s_client . Check TLS/SSL Of Website The basic and most popular use … Read more
Nmap tool provides a popular ports list as a database where this list is also used in network and service scans. Here is the list but before we will look at the command which will list ports according to the popularity. Nmap Top Ports Listing We can use sort command in order to list ports according … Read more