Author Archives: peter

Edit your hostfile the easy way on Windows 10

If you are a Windows User/Developer and often need to alter your hostfile to hit sites on local ip numbers then here is a tool that make it easier to manage it.

You can cut, copy, paste, duplicate, enable, disable and move one or more entries at a time, disable the whole hostfile and some other stuff.

screenshot of hostfileeditor

Host File Editor is free and open source, it can be downloaded from

How to get an SSL A+ rating with Apache

If you need a high rating with tests like then i have an example on a working configuration that will get you the A+ score.

I’m using letsencrypt for my SSL site but you can use any certificate to get the result.

<VirtualHost *:80>
Redirect /
ErrorLog /var/log/apache2/
CustomLog /var/log/apache2/ combined
<VirtualHost *:443>
Header always set Strict-Transport-Security "max-age=63072000; includeSubDomains"
DocumentRoot /home/pva/public_html/
ErrorLog /var/log/apache2/
SSLProtocol All -SSLv2 -SSLv3 -TLSv1 -TLSv1.1
SSLEngine on
SSLHonorCipherOrder on
SSLCertificateFile    /etc/letsencrypt/live/
SSLCertificateKeyFile /etc/letsencrypt/live/
SSLCertificateChainFile /etc/letsencrypt/live/

Remember to enable headers with:

a2enmod headers
systemctl restart apache

I have also made an example for NGINX at this url

Linux | How to get Windows 10 License key from BIOS

If you have installed Linux on your laptop but wan’t to have a Windows VM in virtualbox then chances are that you need a serial number for windows 10.

Normally Windows read the embedded key that are hardcodet into the BIOS of the laptop and Windows in a virtual instance will not be able to read other than the vm’s virtual BIOS so you will need to type one in yourself.

With this command you can extract the serial number:

sudo hexdump -s 56 -e '"WIN key: " /29 "%s\n"' /sys/firmware/acpi/tables/MSDM

Exim | How to hide version number

To prevent showing hackers the version number of your Exim SMTP server it can be hidden by setting this SMTP banner.

Search for smtp_banner in /etc/exim.conf and replace it with:

smtp_banner = "${primary_hostname} ESMTP"

In some setups there is no smtp_banner set then just add the line to the config file

How to fix Chrome dependency problems on Kubuntu 18.04

If you wan’t Googles Chrome browser on Kubuntu 18.04 changes are that you run into an dependency problem when you install the deb package.

I got this result when i tried to install

pva@pva-laptop:~/Downloads$ sudo dpkg -i google-chrome-stable_current_amd64.deb 
Selecting previously unselected package google-chrome-stable.
(Reading database ... 217438 files and directories currently installed.)
Preparing to unpack google-chrome-stable_current_amd64.deb ...
Unpacking google-chrome-stable (76.0.3809.132-1) ...
dpkg: dependency problems prevent configuration of google-chrome-stable:
 google-chrome-stable depends on libappindicator3-1; however:
  Package libappindicator3-1 is not installed.

dpkg: error processing package google-chrome-stable (--install):
 dependency problems - leaving unconfigured
Processing triggers for man-db (2.8.3-2ubuntu0.1) ...
Processing triggers for mime-support (3.60ubuntu1) ...
Errors were encountered while processing:

To resolve the issue you need to install theses dependencies

sudo apt install libappindicator3-1 libindicator3-7