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Windows Update Error 0x80240440 - Fix it now

This article covers how to fix Windows Update Error 0x80240440. 


To fix Windows Update error 0x80240440:

1. Click Start and start typing on your keyboard for "services.msc"

2. In your search results "services.msc" should show up. Open it with a click.

3. A new windows will open containing all Windows services on your system.

Search for "Windows Update"

5. Right-click the "Windows Update" and then click Stop.


Also, you can clean the Windows Update temporary cache folder:

1. Hold your windows-key pressed and hit "R" key simultanous.

2. A small new windows will appear.

3. Type %windir%\SoftwareDistribution\DataStore in this new window and click OK.

4. This will open Windows Explorer on the correct location.

5. Delete all contents of this folder. (Hint: Use Ctrl + A to select all files and folders).


Eventually, you can start the Windows Update Service again:

1. Switch back to the windows Services.

2. Locate Windows Update.

3. Right-click on it and choose Start.

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Disable database UTF8 connectivity on Nagios - How to do it

This article covers how to configure disable UTF8 connectivity to the MySQL/MariaDB databases. By default Nagios XI uses UTF8 however sometimes this needs to be disabled to allow MySQL / MariaDB to define the connectivity method.

This configuration ensures that characters from different languages can be correctly stored and retrieved in the databases.


The Nagios XI Configuration Directive

The following configuration directive was added in Nagios XI 5.4.13:

$cfg['db_conn_utf8'] = 0;

 To determine if you currently have that directive enabled, establish a terminal session to your Nagios XI server as the root user and execute the following command:

$ grep db_conn_utf8 /usr/local/nagiosxi/html/config.inc.php

 If the grep command produces NO output then the directive does not exist in your configuration and it needs to be added. This can be added with the following command:

$ printf "\n\$cfg['db_conn_utf8'] = 0;\n" >> /usr/local/nagiosxi/html/config.inc.php

 

If the grep command produced output then it can be changed with the following command (sets it to 0):

$sed -i "s/db_conn_utf8'\] =.*/db_conn_utf8'\] = 0;/g" /usr/local/nagiosxi/html/config.inc.php

Defining the directive to 0 will resolve the issue you for garbled or ??? characters.


If you wanted to change it to 1 then use the following command:

$sed -i "s/db_conn_utf8'\] =.*/db_conn_utf8'\] = 1;/g" /usr/local/nagiosxi/html/config.inc.php

 

The change takes effect immediately.

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Windows update error 0x800f0805 - Fix it now

This article covers methods to resolve windows update error 0x800f0805. 

Windows update error #0x800f0805 indicates that the Windows edition was not detected. Check that the specified image is a valid Windows operating system image. All you need to do is restart your computer and try to activate it again, and it should work.


Causes of #error 0x800f0805 in Windows Update:

1. Bugs in update delivery to your system – This means that there is no fault in your system, instead, the Microsoft servers are experiencing issues.

2. Corrupted Windows files


Methods to fix the #Windows error 0x800f0805:

1. Using Windows Troubleshooter 

This built-in feature can automatically identify and apply fixes to issues on your device.

2. Manually downloading and installing the update

We can use the official Microsoft Update Catalog to download and install system updates manually.

3. Using System File Checker (SFC)

4. Using DISM

We recommend using a DISM scan after using SFC.

5. Resetting Windows Update components

This method will reset the Windows Update.

6. Reset your PC

If none of the above methods worked, you can freshly reinstall your OS without losing any files or settings by using 'Reset this PC' feature.

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Windows update error 0xC190012E - Fix it now

This article covers methods to resolve Windows update error 0xC190012E.

This error generally happens when the user either tries to update their Windows operating system to Windows 10 v 1903 or when upgrading Windows 10 from insider preview for security reasons.


What triggers Windows Update Error 0xC190012E?

If the Windows Update is continuously failing to search for the Updates or are unable to install them due to error 0xc190012e then here is the problem that causing this error.

1. Missing Registry

2. No Internet accesses

3. An issue in Windows update service

4. Corrupt system files

5. Misconfiguration

6. Virus or Malware attack

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Set up Amazon CloudFront with WordPress site - Do it now

This article covers how to set up Amazon CloudFront with WordPress site. WordPress performs reasonably well out of the box, but there is room for improvement—the number of WordPress plugins that address performance is evidence of this.  However, the easiest way to improve the user experience is to accelerate one's entire WordPress website by using CloudFront. 

Doing this will not only improve your site's responsiveness, but it may also reduce the overall cost of operating your WordPress infrastructure, as reducing the load on your web servers may help you scale down the required infrastructure. 

In fact, CloudFront can significantly help your site cope with an unexpected load when your site gets popular.


How does CloudFront help?

Many AWS customers have users spread across the globe that they want to reach. However, what once required an immense engineering effort can now be easily built using AWS Regions and Edge locations, which allow you to serve content from the locations closest to those users.

Data transfers on the internet depend largely on global networks of fiber optic cables, allowing very high bandwidth data transfers. 


As the speed of light is proving a difficult challenge to overcome, Amazon CloudFront improves the experience for users accessing your websites in several other ways, including:

1. Anycast DNS ensures your customers are routed to the nearest edge location.

2. Cached content, when available, is delivered to your users from the edge location.

3. When data needs to be fetched from your site CloudFront optimizes network throughput by managing the transfers between Edge Locations and your website.  This traffic runs over the Amazon Global Backbone, where optimized TCP configuration ensures more bytes are in-flight on the network, improving throughput, while TCP connection re-use eliminates much of the latency associated with establishing connections.   In this way, whether content is cached or not, it will be accelerated by delivery over optimized network paths.

4. Finally, negotiating and offloading Transport Layer Security (TLS) at the CloudFront Edge further improves performance, reducing connection setup latency, and further supporting back-end connection re-use.

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Force DHCP Client to Renew IP Address - Perform it now

This article covers how to force DHCP client to renew IP address. You need to use Dynamic Host Configuration Protocol Client i.e., dhclient command. 

The client normally doesn't release the current lease as it is not required by the DHCP protocol. Some cable ISPs require their clients to notify the server if they wish to release an assigned IP address. 

The dhclient command, provides a means for configuring one or more network interfaces using the Dynamic Host Configuration Protocol, BOOTP protocol, or if these protocols fail, by statically assigning an address.


Linux renew ip command using dhcp:

The -r flag explicitly releases the current lease, and once the lease has been released, the client exits. 

For example, open terminal application and type the command:

$ sudo dhclient -r

Now obtain fresh IP address using DHCP on Linux:

$ sudo dhclient


To start DHCP client in Linux:

1. To start the DHCP service, type the following command: # /etc/init.d/dhcp start.

2. To stop the DHCP service, type the following command: # /etc/init.d/dhcp stop. 

The DHCP daemon stops until it is manually started again, or the system reboots.


How can I renew or release an IP in Linux for eth0?

To renew or release an IP address for the eth0 interface, enter:

$ sudo dhclient -r eth0

$ sudo dhclient eth0

In this example, I am renewing an IP address for my wireless interface:

sudo dhclient -v -r eth0

sudo dhclient -v eth0


Command to release/renew a DHCP IP address in Linux:

1. ip a - Get ip address and interface information on Linux

2. ip a s eth0 - Find the current ip address for the eth0 interface in Linux

3. dhclient -v -r eth0 - Force Linux to renew IP address using a DHCP for eth0 interface

4. systemctl restart network.service - Restart networking service and obtain a new IP address via DHCP on Ubuntu/Debian Linux

5. systemctl restart networking.service - Restart networking service and obtain a new IP address via DHCP on a CentOS/RHEL/Fedora Linux

6. nmcli con - Use NetworkManager to obtain info about Linux IP address and interfaces

7. nmcli con down id 'enp6s0' - Take down Linux interface enp6s0 and release IP address in Linux

8. nmcli con up id 'enp6s0' - Obtian a new IP address for Linux interface enp6s0 and release IP address using DHCP

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