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Category Technical

This category contains purely technical posts

Linux common Port Numbers

Here is a list of common port numbers in linux servers.   [perch_heading title=”Port Numbers”][/perch_heading] 21 => FTP 22 => SSH 23 => Telnet 25 => SMTP Mail Transfer 43 => WHOIS service 53 => name server (DNS) 80 =>… Continue Reading →

A glance on Virtualhost

Virtaulhost is used to host multiple domains in the same server.  This can reduce the cost and administration workload for seperate servers for each domain. There are two types of  virtaulhost. 1. Name-based virtulahost 2. IP-based virtualhost Name based Virtualhost:… Continue Reading →

StickyBit, SUID & SGID in Linux

The regular file and directory permissions in Unix/Linux world are read write and execute permissions on owner, group and other levels. This article discusses special permissions for files and/or directories. SUID Bit When an executable file runs, it runs under… Continue Reading →

NIS on RedHat Linux

The following describes a procedure to set up NIS network name service under Red Hat Linux. This is geared toward a small intallation with only one domain. However, it should be fairly evident how to add more NIS domains. The… Continue Reading →

The following details how to access available Windows fileshares on a remote server using the samba client. It presumes the IP of the remote host is known. Get list of NetBIOS names from the remote host: linmiri% nmblookup -A IP.ADD.RE.SS… Continue Reading →

Exim a quick glance

Here are some useful things to know for managing an Exim 4 server. This assumes a prior working knowledge of SMTP, MTAs, and a UNIX shell prompt. Message-IDs and spool files The message-IDs that Exim uses to refer to messages… Continue Reading →

Zabbix Installation

A Web Host has to actively monitor all the services running on each of its Internet Servers. Customers assume that the services advertised by the host are available 24/7, and hence Internet servers monitoring takes a high priority in the… Continue Reading →

How to Recover from an Accidental SSH Disconnection on Linux

SSH remains the most common way by which we access our Linux servers. Most people don’t manually log into the server console itself. Through SSH, you can do almost everything except for certain low-level operations. However, this leaves us open… Continue Reading →

1.4 Billion Plain-Text Credentials Leaked On The Dark Web

Searchable database of unencrypted Usernames and passwords available online   Security experts have found a 41-gigabyte (GB) archive containing over 1.4 billion unencrypted user credentials on the Dark Web, which had been updated at the end of November. The huge database… Continue Reading →

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