“No space left on device” error on empty drives

When you try to copy files from your hard drive to an external device such as an external hard drive or USB stick, you may get an error message saying that there is no free space left on your device, even though you just deleted everything to make room. This is most likely due to ... Read more

Change grub default boot option on Linux Ubuntu/Mint

Grub's default boot option is stored within a config file found on the partition where your Master Boot Record is located (if you had it installed previously, there may also be grub.cfg files on other partitions, but these won't affect boot sequence). Its direct path is /boot/grub/grub.cfg and it has to be opened as root, ... Read more

Monitor Processes With Windows PowerShell

Maybe you have already come across applications that require you to rearrange things on your desktop for optimal visibility or which you only use in combination with other programs or items - an automated startup or rearrangement would come in handy in those situations. Monitor Processes with  PowerShell The following little PowerShell script allows just ... Read more

How to Call Functions in Powershell (Windows)

Functions in Powershell are called without any comma or parenthesis, although they are defined using them. The correct way to call a function with two variable parameters would be: test $local1 $local2 The wrong way is: test($local1, $local2) If you put parentheses around your parameters, your input is treated as an array and thus the ... Read more

Create a Self-signed SSL Certificate on Windows

SSL (Secure Socket Layer) is used for encryption and decryption, processing of S/MIME signed or encrypted mails, generation of certificates, and more. To use it on Windows (32 and 64 bit versions), download the OpenSSL tools from code.google.com/p/openssl-for-windows/downloads/list. Uncompress it anywhere you like and start it by double-clicking the openssl.exe executable in the \bin folder. ... Read more

How to renew the SSL certificate for dovecot on CentOS

Make a backup of the old key and certificate file mv /etc/ssl/certs/dovecot.pem /etc/ssl/certs/dovecot.pem.old mv /etc/ssl/private/dovecot.key /etc/ssl/private/dovecot.key.old Create the new SSL certificate openssl genrsa -out /etc/ssl/private/dovecot.key 1024 openssl req -new -x509 -key /etc/ssl/private/dovecot.key -out /etc/ssl/certs/dovecot.pem -days 730 Restart Dovecot: service dovecot restart

How to enable port 465 (smtps) in postfix mailserver

More and more internet access providers are closing port 25 to reduce spam except for connections to their own mail servers. If you run your own email server and have problems connecting to it on port 25, you can enable port 465 (SMTPS) in postfix as a workaround. Edit the /etc/postfix/master.cf file: nano /etc/postfix/master.cf and ... Read more