19 May 2017

Zabbix : use external ip in simple checks

In Zabbix, simple checks are done by the Zabbix Server or Proxy on the default agent IP address, usually the internal one.
If you would like to monitor some services like SSH or SMTP using the external IP address, simply add another Agent Interface with the external IP.

Then choose the external interface in the item configuration:

03 February 2017

Resolve "Cannot download packages whilst offline" issue in Deja-Dup backup software

If you got the error message "Cannot download packages whilst offline" but your internet connection is active, this is probably because you've managed the network configuration yourself and the network manager is reporting an offline status even if it's not correct.

To fix this issue, simply edit the file /etc/NetworkManager/NetworkManager.conf and change the following configuration to be inline with:
Then restart the Network Manager :
sudo service NetworkManager restart


13 January 2017

Using TeamViewer on headless (without monitor) ubuntu machine

In order to get TeamViewer running smoothly (without lag, or simply cannot install) when no monitors are connected, you need to emulate one.

This is done by creating (or editing) this file :
And add the following content :
Section "Device"
    Identifier  "Configured Video Device"
    Driver      "dummy"

Section "Monitor"
    Identifier  "Configured Monitor"
    HorizSync 31.5-48.5
    VertRefresh 50-70

Section "Screen"
    Identifier  "Default Screen"
    Monitor     "Configured Monitor"
    Device      "Configured Video Device"
    DefaultDepth 24
    SubSection "Display"
    Depth 24
    Modes "1024x800"
Reboot the computer


15 June 2016

Windows 10 Pro English UI : Fix the keyboard layout always switching to UK/US when it has been set to Belgian French

Simply install the french language pack, even if it's not set as the OS's UI language:

How to send large backup on Hubic using Synology Hyper Backup when you get connection issues for the first synchronization

In your backup task, simply drill down in the folder tree to select only a few folders amongst the whole set of folders you would like to backup in order to keep the backup size and time reasonable.

When the backup task succeeds, edit the task and add a few folders more. 

Then relaunch the backup task.
The Synology Hyper Backup service will only backup the freshly added folders and data that has changed from the last succeeded backup task.

Reapeat that operation untill all the folders are backuped.

13 December 2015

Workaround for tp-link tl-wa854re Access Point wifi extender network issue

For an unknown reason, my tp-link Wifi extender has suddenly stopped working.

In fact, it didn't find anymore the DHCP server, even connected to the root Wireless network.

In the network interface of a device connected to the AP I saw the following parameters obviously set by the AP as this was not in my home network range:
DHCP server :
DNS server :
Gateway :
So I've simply entered this ip address in a browser from a client device of the AP, using admin/admin as user and password and set a static ip address to the AP (in Network > LAN) and disabled the embedded DHCP server (in Network > DHCP settings).