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Our site's HTTPS certificate is replaced every 90 days. Only on the day it expired did I remember to unwrap the entire certificate chain: the three-layer introduction letter: leaf, middle, and root. The browser had a list of over 300 institutions and matched each code one by one. Three types of certificates get three types of errors, three types of issues, and the extra user ID that appears on your phone is like giving someone a copy of your home key....

Is your home WiFi working fine, but you can't get in when you go out? First, see if you're stacked with two layers of NAT tubes. The optical modem router mode stacks one layer, the operator CGNAT stacks another layer, and the host network can stack another layer. If you don't fall for the trap in two steps, choose the solution by the source—this article explains everything in one go....

When connected to WiFi in the mall, the login page pops up automatically—who notifies the phone? I tested the network probe addresses for Apple, Xiaomi, Huawei, and Windows. The responses of 204, 302, and timeout determine whether the phone is alert or cannot access the internet, and I also explained self-rescue methods for false positives....

After turning off the game accelerator on my niece's laptop, the browser spins in circles, and WeChat videos don't interfere at all. Only after flipping to the bottom of the error page in small print did I see the real culprit: the system proxy hasn't been restored. The difference between HTTP proxies and SOCKS5, who is secretly changing your settings, and clearing the remaining three-layer sequence—explained all in one go....

The same NAS, company WiFi file transfer is 500KB/s, but phone data keeps upstream—the difference isn't speed, it's the road. Whether NAT holes work or not determines whether you go direct or relay. I break down the entire process and explain it clearly, including the speed boost order....

When I connected to my home NAS and ran movies out of town, the speed was stuck at 5MB/s. I checked all the network cables and routers and found nothing wrong. Finally, I found the truth in the service hall app: the home bandwidth uplink is only 50MB. Upstream and downstream asymmetry isn't a scam. From ADSL to fiber optic rules, the rules have never changed. This article clearly explains the three main reasons and key points for uplink paths....

During the morning rush hour, I was suddenly stuck by a question when using a bus card: If the card has no battery, where does the electricity come from? After looking through it, I realized that NFC is a card reader that supplies power to the card through the air. Touching a router with a phone to connect WiFi, simulating access cards, or touching QuickPass all follow this principle, and the truth behind access card simulation failure is also here....

My mom's router is scheduled to shut down at midnight and doesn't run at night. The root cause is the system time resets to zero. I did some research and found out: phones rely on base stations to send time, computers rely on motherboard batteries, routers don't have anything but rely entirely on NTP. I sent a 48-byte packet using Python to see how the timing issue actually worked....

During the week the study computer switched on and off, I switched DNS and cleared the cache for three days before finally squatting down to see the crystal connector had loosened. Since then, I have always searched from the bottom up: cable, address number, leaving the neighborhood, sending emails, and opening letters—five checkpoints. Each checkpoint is the fastest verification method, and ping the gateway can cut off half the suspicion....

I wore my Bluetooth headphones into the kitchen to heat food, but as soon as the stove turned on, the headphones would crack and fall off, and the stove would shut down on its own. After checking, I realized that microwaves, WiFi, Bluetooth, and Zigbee are all squeezed into the 83.5MHz wide 2.4G band. Bluetooth survives by moving 1,600 times per second, and frequency hopping was invented by a Hollywood actress....