Hi, I’m Stefan Pejčić. I am a virtualization architect, system administrator, WordPress plugin developer, cPanel partner and Python developer.
In my 10+ years of working in IT I’ve concluded one thing:
technology is easy, it’s the people that are hard.
Everybody takes IT folks for granted, only noticing them when something is not working. And when those situations happen, we either come up with a quick solution or use a strategy that worked in the past. PCx3 is a blog that provides exactly that: How To's and hacks that worked for me, and hopefully they'll help other sysadmins as well.
Thank you for stopping by.
wget not working? Add user/agent, for example: Mozilla/5.0 wget -U Mozilla/5.0 or wget -U mozilla By default wget uses an uncommon user-agent Wget/VERSION, which due to various security policies some servers are blocking. To solve this, specify the...
To create a named session use: screen -S testsession to list all session: # screen -ls There is a screen on: 19415.something (Detached) 1 Socket in /var/run/screen/S-root. to rename an active session use -X sessionname screen -S 19415.something -X...
Here is how to enable remote access to MongoDB in cPanel: Open port on the firewallEnable remote access in mongodb.confCreate a new admin user for mongodb Open default MongoDB port 27017 on firewall Default port for mongodb is 27017 so we need to...
ncdu / du and df show different sizes: du is reading information from the directory tree, it is more accurate than df but slower.df reads meta data of the file system therefore it is faster, but not that accurate because it works with blocks...
Here are 2 ways to list all domaind for a cPanel account, including: Subdomains, Addon domains, Aliases and Parked domains. From cPanel Login to the user cPanel and go to “Domains” 2. From the terminal For each cPanel account there is a...
Here are different methods to check if an IP address is blocked in Config Server Firewall (CSF). Check if an IP is blocked in CSF from the WHM WHM > Config Server Firewall > Search for IP 2. Check if an IP is blocked in CSF from the terminal: csf -g...
From the terminal (SSH): grep -Ril "find /home/username/public_html/ -type f -mtime -2" From a .php file: <?php $last=shell_exec('grep -Ril "find /home/username/public_html/ -type f -mtime -2"'); echo "<pre>$last</pre>"; ?> The output will...
Here is how to delete all emails older than 6 months from cPanel using a cronjob. First, we need to know the exact location where emails are stored. On cPanel, emails are stored in 3 folders: new – incoming emails are received in this...
Content Security Policy (CSP) is a security layer that can help you detect and mitigate Cross Site Scripting (XSS) and data injection attacks. If your web application displays and stores custom HTML/CSS from user input, then you most certainly need...
Here in how to change the default Time Zone permanently in cPanel using the .htaccess file Step 1. First, check you current time yone settings using a simple .php script like this: <?php echo "Today is " . date("Y/m/d") . "<br>"; echo "The...
Here is a simple PHP script that you can use to test if a port is open on the server or not. <?php $host = $_SERVER['SERVER_ADDR']; $ports = array(21, 25, 80, 81, 110, 443, 3306); foreach ($ports as $port) { $connection = @fsockopen($host...
If you use dynamic DNS privately and need to whitelist a hostname or domain name in cPanel/WHM, you can use the DYNDNS feature of ConfigServer Security and Firewall plugin. csf.dyndns is a file that is specifically used for allowing hostnames in CSF...
