How to mitigate excessive Internet data usage of MS Windows 10

If you have upgraded your Microsoft Windows operating system to the latest Windows 10, and found out that your computer is taking up a lot of your Internet bandwidth and consuming a lot of your data usage, there are 2 settings for you to mitigate this problem.

The first setting is to disable peer-to-peer sharing of Windows Update files and Windows apps that you have downloaded in your computer with other MS Windows 10 computers in the Internet.

Go to Start > Settings > Update & Security.

Then, go to Windows Update and click on "Advanced options".

Inside Advanced Options, click on "Choose how updates are delivered".

In the next screen about Update from more than one place, you can either set the option "when this is turned on, your PC may also send parts of previously downloaded Windows updates and apps to PCs on your local network, or PCs on the Internet, depending on what's selected below.' to OFF, or if you want to share with PCs within your local network but not across the Internet, leave it as ON and select "PCs on my local network".

If you leave the option to be the default "PCs on my local network, and PCs on the Internet", many computers from the Internet will just swarm in and suck off your Internet bandwidth, causing your computer and your Internet link to become slow, and if your Internet line is on quota usage, this will also consume up your data plan within a short period of time.

To further mitigate the Internet data usage, the second setting is to tell Windows that your Internet connection is metered connection. This will prevent background processes and Windows apps use up your Internet link to sync information and provide real time updates to you.

Go to Start > Settings > Network & Internet.

Then click on "Advanced options" under Wi-Fi screen.

Set the Metered Connection to ON.

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If your Mozilla Firefox web browser can no longer access certain HTTPS websites, try this fix

Mozilla Firefox version 39 onwards will by default block the HTTPS connections to web servers using weak ephemeral Diffie-Hellman (DH) keys.

Bear in mind that by default, Firefox is set to automatically update itself from time to time, so your version will eventually be updated to version 39 and above.
This is a security measure against the Logjam attack. You can click here to read more about this Logjam attack.
If you visit to an affected website using HTTPS connection with Firefox, you will see the following error message:

Affected websites including the webmail of older version of Zimbra Collaboration Suite. Click here for more detail.
You can fix this by installing the Disable DHE 0.1.2 Add-on by Mozilla to Firefox.

To install, go to Menu > Add-ons in Firefox, and search for "Disable DHE". Once you found the add-on, click the Install button to install it.

Restart Firefox and check if this fix works for you.

If your Mozilla Thunderbird email client can no longer get email from mail server, try this fix

One day, I found that there was no new email coming in to my Mozilla Thunderbird email client for quite a long time, but I could still receive new emails from the same server with my smartphone.

I looked into the Error Console of Thunderbird by going to Tools > Error Console (you can also press the hotkeys Ctrl-Shift-J to go to the same place) and found this error message:

A search in the Internet informed that Mozilla Thunderbird version 38.1.0 and above will block the connections to any mail server using weak ephemeral Diffie-Hellman (DH) keys by default, therefore it can no longer retrieve new emails from the affected server.

Bear in mind that by default, Thunderbird is set to automatically update itself from time to time, so your version will eventually be updated to version 38.1.0 and above.

Blocking the weak Diffie-Hellman key exchange is in fact a security measure against Logjam attack against the TLS protocol. You can click here to read more about this Logjam attack.

Affected email servers including older version of Zimbra Collaboration Suite. Click here for more detail.

While waiting for the mail server administrator to fix the problem at the server side, I applied the Disable DHE 0.1.2 Add-on by Mozilla to my Thunderbird, and it can now continue to receive new emails from the server.

To apply this add-on to your Thunderbird email client, click on the link above to go to its download webpage.

Then, click on the "Download Anyway" link and save the file disable_dhe-0.1.2-fx.xpi in your computer.

After that, go to Tools > Add-ons in Thunderbird, pull down the menu button on the left of "search all add-ons" and select "Install Add-on From File..." to install this disable_dhe-0.1.2-fx.xpi into your Thunderbird.

Restart Thunderbird and check if this fix works for you as well.