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[Solved] Postfix: “queue file write error”

If you get an error like: Apr 15 12:41:03 webb4 postfix/sendmail[11234]: fatal: web1_user(12967): queue file write error in your mail…

How to Turn off Firewall in Windows 10

A firewall is used to keep unauthorized users from accessing files and resources on your computer. Unfortunately, the Windows firewall is…

How to use Event Viewer to find the boot time for your PC under Windows 10

Everybody owning a PC has had to deal with the resulting degradation of the system boot. You can use the…

How to speed up logins in pure-ftpd on Debian or Ubuntu Linux by disabling name resolution

If you experience problems with slow logins in pure-ftpd, this is often caused by a problem with the resolving of…

Configure fail2ban to use route instead of iptables to block connections

Fail2ban uses iptables by default to block incoming connections when they exceed the max.  login retries. The iptables rules used…

Backup and Restore MySQL Databases on the shell

One way to create a backup of a MySQL database on the shell is to use the mysqldump command. Mysqldump…

How to enable verbose logging in pure-ftpd on Debian and Ubuntu

To turn on verbose logging (e.g. to debug FTP connection or authentication problems) in pure-ftpd FTP server on Debian and…

[Solved] Windows starts slower after defragmenting the hard disk

If your Windows installation starts slower after you defragmented the hard disk, it might be necessary to run the defragmentation…

[SOLVED] The following signatures were invalid: EXPKEYSIG B188E2B695BD4743 DEB.SURY.ORG Automatic Signing Key

Here is the solution if you've got the following error message when updating package lists on Debian (apt-get update): The…

How to see which application prevents your PC in Windows 10 from entering sleep mode

Have you ever intended your computer to go back to sleep mode only to find that it is still turned…

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