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DNS, SSL & Network Troubleshooting Guides

Free guides and tutorials for DNS, SSL, networking, and web security.

Diagram of the six layers to test a public API endpoint: DNS resolution, port 443, TLS certificate, HTTP headers, CORS, and JSON payload

How to Test a Public API Endpoint: DNS, Port, TLS, Headers & CORS

A layer-by-layer method to test any public API endpoint when it stops responding — check DNS resolution, port 443, the TLS certificate, HTTP status, CORS headers, and the JSON payload, in that order.

Aug 239 min read
Best OpenClaw hosting comparison of seven VPS providers for running an always-on AI agent

Best OpenClaw Hosting in 2026: 7 VPS Options Compared

Where to host OpenClaw 24/7: managed OpenClaw VPS, budget clouds, free tiers, and self-hosting compared — specs you actually need, security notes, and honest tradeoffs.

Aug 1710 min read
How to install OpenClaw on a VPS guide showing the official install script command in a terminal

How to Install OpenClaw on a VPS (Docker & npm Guide)

Step-by-step OpenClaw setup on a VPS: install script, npm, and Docker methods, Node.js requirements, gateway security hardening with SSH and Tailscale, and troubleshooting.

Aug 1711 min read
Verpex hosting review 2026 covering plans, pricing, performance tests and support quality

Verpex Hosting Review 2026: Plans, Pricing & Verdict

Hands-on Verpex review: WordPress hosting from $0.59/mo, LiteSpeed + NVMe performance, 24/7 support, reseller and VPS plans, real pros and cons, plus the best current discount.

Aug 1710 min read
DNS server unavailable error fix guide showing the Windows diagnostics message and the fastest resolver fixes

DNS Server Unavailable: What It Means & How to Fix It

Fix the 'DNS server is unavailable' error on Windows, Mac, and routers with 8 proven solutions — flush and renew DNS, switch to public resolvers, and repair the router's DNS forwarder.

Jul 148 min read
WiFi connected but no internet fix guide showing the 12 fastest solutions from DNS changes to router DHCP repair

WiFi Connected But No Internet? 12 Fixes That Actually Work

Fix 'WiFi connected but no internet access' on Windows, Mac, Android, and iPhone — from DNS and IP renewal to router DHCP fixes, ordered from fastest to most thorough.

Jul 149 min read
AT&T DNS servers complete guide showing default IP addresses 68.94.156.1 and 68.94.157.1 and faster alternatives like Cloudflare and Google DNS

AT&T DNS Servers: Full List & Setup Guide (2026)

AT&T DNS server IP addresses (68.94.156.1 / 68.94.157.1), how DNS works on AT&T Fiber gateways like the BGW320, and faster alternatives like Cloudflare and Google DNS.

Jul 1310 min read
ERR_CONNECTION_REFUSED error fix guide showing the Chrome refused to connect screen and the four fastest solutions

ERR_CONNECTION_REFUSED: What It Means & How to Fix It

Fix the ERR_CONNECTION_REFUSED error in Chrome on Windows, Mac, Android, and iOS with 9 proven solutions — plus dedicated fixes for localhost and server owners.

Jul 139 min read
ERR_NAME_NOT_RESOLVED error fix guide showing the Chrome server IP address could not be found screen and the fastest DNS solutions

ERR_NAME_NOT_RESOLVED: What It Means & How to Fix It

Fix the ERR_NAME_NOT_RESOLVED error in Chrome on Windows, Mac, Android, and iOS with 9 proven solutions — from flushing DNS to fixing Secure DNS and Private DNS settings.

Jul 138 min read
Comcast and Xfinity DNS servers complete guide showing default IP addresses 75.75.75.75 and faster alternatives like Cloudflare and Google DNS

Comcast / Xfinity DNS Servers: Full List & Setup Guide (2026)

Comcast and Xfinity DNS server IP addresses (IPv4 & IPv6), how to change DNS on an xFi Gateway, and faster, more private alternatives like Cloudflare and Google DNS.

Jun 510 min read
HTTP 302 status code infographic showing temporary redirect flow with Location header and 301 vs 302 vs 307 comparison

302 Status Code (HTTP 302 Found): What It Means & When to Use It

The 302 status code is a temporary HTTP redirect. Learn what HTTP 302 Found means, how it differs from 301/307/308, and how to send and debug it correctly.

Apr 269 min read
DNS_PROBE_STARTED error fix guide showing Chrome DNS probe failure and step-by-step solutions for all operating systems

DNS_PROBE_STARTED: What It Means & How to Fix It

Fix the DNS_PROBE_STARTED error in Chrome, Edge, and Brave. Learn what causes this DNS error, how it differs from NXDOMAIN, and 8 proven fixes for every OS.

Mar 149 min read