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SSL Certificate Checker

After installing the SSL certificate on the Nginx web server, you need to check if it is installed correctly.

I installed the SSL certificate two months ago. The Sectigo ECC certificate.

Now I change the certificate files.

Previously, I put the site SSL certificate file content and the SSL-bundle file altogether. The final SSL certificate file is 4.36KB. It includes three certificates. The guide is from Comodo official site. Sectigo site has a similar guide here.

Now, I remove the last one. Just keep the site certificate and the middle one. Total size is  3.01KB.

The certificate I deleted from the old file is for USERTrust ECC Certification Authority. It is already included in the Trusted Root CA list.

Then, I tested the new certificate file, which has two certificates only, on different online SSL checking tools.

 

Geocerts SSL checking Result

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7 Tips to Wi-Fi Performance Optimization

The seven must-know tips for your Wireless Wi-Fi network Performance Optimization.

1. Placements of Devices

Radio signal travels through air to its destination. The radio signal will be reflected, refracted or absorbed if there is something on the way.

So, Keep the wireless router away from blockage, especially metal and bricks.

2. Antennas Positioning

Antennas has direction.  So try to put the antenna in multiple directions to avoid the generation of dead zone.  The D-Link SmartBeam provides much better directions.

3. Handling Radio Interference

As I discussed before, choose the least used wireless channel when possible.

4. Maximizing Channel Bandwidth

Later generations of wireless protocol may utilize higher bandwidth to deliver the superior performance from the previous. So choose 40MHz instead of regular 20MHz, it provides double bandwidth for your connection if possible with the wifi adapter.

5. Encryption

For security reasons, data encryption is must have. There are two main different encryption methods, or Cipher Type. TKIP and AES. TKIP has poor performance. So, select the AES for your network.

6. Other Unique Options

Some unique options may available for certain router and wireless adapters. Most are from same brand. Such as TX Bursting, Optimize AMPDU, Optimize ack suppression or Jumbo Pack.  But do it cautiously,  it may break the connection if the device is not compatible.

7. Further Extend the Wireless Coverage

To further extend the network coverage, one can also consider put a Wi-Fi repeater. I setup my WIRELESS-N WZR-HP-G300NH2 as repeater with DD-WRT rom.

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