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CSS Container Queries: Responsive Components by Their Own Size

Secure PHP Logout and Revoke Sessions Across Devices

Verify a Downloaded File with SHA-256 on Windows and Linux

A Website Opens on Other Devices but Not One Computer

WHM Apache Status Fails While Apache Is Running: What to Check

cPanel SMTP 421 Errors: Temporary Deferral or Connection Limit?

Linux Server Performance: Measure Before Tuning

Nginx and Apache Security: Review the Whole Request Path

Does Changing the SSH Port Improve Security?

Deleted a Linux Log but Disk Space Is Still Full? Find the Open File

Linux Deleted a Linux Log but Disk Space Is Still Full? Find the Open File

You deleted a large log, the directory became smaller, but df -h still reports a full filesystem. Before deleting anything else, check whether a runni...

MySQL Error 1040 Too Many Connections: Check Before Raising the Limit Image

Databases MySQL Error 1040 Too Many Connections: Check Before Raising the Limit

The site works for a while, then requests start failing with SQLSTATE[HY000] [1040] Too many connections. Raising max_connections is an easy suggestio...

Cyber Security Does Changing the SSH Port Improve Security?

Moving SSH from its default port can reduce routine connection attempts in logs. It does not make the service invisible, and it does not stop a target...

PHP Secure PHP Logout and Revoke Sessions Across Devices

Logging out should make the current browser stop presenting an authenticated session. Clearing a page variable is not enough: the server-side session ...

PHP Email Activation: Verify Addresses with Expiring Tokens Image

PHP PHP Email Activation: Verify Addresses with Expiring Tokens

Email activation can confirm that a person can receive mail at an address, but it does not prove a legal identity. Treat the activation link as a temp...

Firebase Review: Managed Backend Services and Design Tradeoffs Image

Reviews Firebase Review: Managed Backend Services and Design Tradeoffs

Firebase provides managed services that can help a team build an application without operating every backend component itself. Depending on the produc...

Cyber Incident Response: Contain, Investigate and Recover Image

Cyber Security Cyber Incident Response: Contain, Investigate and Recover

During a cyber incident, teams face pressure to restore service quickly. Actions taken in the first minutes can affect whether the attacker remains ac...

OWASP Top 10: Use the Risk List to Improve a Web App Image

Cyber Security OWASP Top 10: Use the Risk List to Improve a Web App

The OWASP Top 10 is an awareness document that groups important web application security risks. It can help a team start a review, but it is not a com...

Wi-Fi Security: Protect the Router and Connected Devices Image

Cyber Security Wi-Fi Security: Protect the Router and Connected Devices

Wi-Fi security depends on the router, the wireless encryption setting and the devices that join the network. A hidden network name or a changed SSID i...

Find Which Process Owns an Unexpected Open Port on Linux Image

Linux Find Which Process Owns an Unexpected Open Port on Linux

An open port scan tells you that something answered; it does not tell you whether the listener is expected or safe to stop. Identify the local process...

Visual Studio Code vs VSCodium: Distribution, Services and Extensions Image

Reviews Visual Studio Code vs VSCodium: Distribution, Services and Extensions

Visual Studio Code and VSCodium share much of the same upstream code, but they are different distributions. The choice affects product services, licen...

One-Time PHP Password Reset Links with Expiration Image

PHP One-Time PHP Password Reset Links with Expiration

A password reset link is a temporary credential. Anyone who obtains it may be able to change the account password, so the token must be difficult to g...