Articles about dns | UserComp.com

Subdomain Custom NS Record Failing to Resolve: Troubleshooting Steps

Resolve subdomain custom NS record failures by verifying parent zone delegation and adding required glue records for nameservers within the delegated domain.

Understanding IPv6 DNS Results using dnsmasq

Resolve IPv6 DNS lookup failures by verifying dnsmasq AAAA record handling for local DHCPv6 leases and upstream forwarding.

Raspberry Pi with Quectel EC25 Modem: DNS Fail on wwan0 Interface

Fix DNS resolution failures on Raspberry Pi Quectel EC25 wwan0 by manually configuring static DNS servers in NetworkManager.

Disabling Firefox's 'Choose Your Own DNS' Feature on Windows with Cloudflare DNS

Disable Firefox's DNS-over-HTTPS to resolve conflicts when using custom Cloudflare DNS on Windows.

How to Find Out What Domain an IP Address is Associated With

Resolve PTR records to identify the hostname associated with an IP address.

DNS Queries Not Going to AdGuard Home When Configuring Router DNS?

Resolve AdGuard Home DNS failures by verifying static IP consistency, configuring router DHCP DNS settings, and allowing port 53 through UFW.

Resolving DNS Issues with Rocky Linux 8 Virtual Machines

Fixes DNS resolution failures in Rocky Linux 8 VMs by verifying NAT connectivity and correcting systemd-resolved settings.

How to Resolve Hostname with mDNS on Ubuntu 22.04 to Access Local Network Devices

Resolve .local hostnames on Ubuntu 22.04 by installing avahi-daemon and nss-mdns, then configuring /etc/nsswitch.conf to enable mDNS name resolution for local network devices.

Browser, Router, and DNS Cache: Which Takes Priority?

Resolve stale content by clearing the OS DNS cache first, as it takes priority over browser and router caches.

Multiple MX DNS entries for mail server backup / redundancy?

Configure multiple MX records with distinct priority values to enable automatic failover from a primary mail server to a backup host during downtime.

Troubleshooting Internet Modem's Failure to Resolve Local IPV6 Hosts

Resolve local IPv6 hostnames by configuring DNS forwarding, verifying scope identifiers for link-local addresses, and ensuring firewall rules allow UDP port 53 traffic.

Updates on DNS Registry Registration Details: Do Domains Still Require a Natural Person Registrant?

Clarifies that domain registration requires a verifiable natural person or legal entity for accountability, distinguishing this from public privacy protection services.

Edge - Why is OpenDNS issuing the certificate for bing.com?

Resolve Microsoft Edge security warnings when OpenDNS intercepts SSL traffic by installing the OpenDNS root certificate in your trusted store.

Understanding Dynamic Name System Architecture: A Comprehensive Guide

Explains the hierarchical DNS architecture and resolution process to help troubleshoot network connectivity issues.

DNS Drops Out Regularly in Windows 11: How to Fix

Resolve intermittent DNS drops in Windows 11 by flushing the cache and resetting TCP/IP settings to restore reliable name resolution.

Vodafone Router NO-IP DDNS: Disable Wi-Fi Settings Redirection to Access Website

Resolve Vodafone router redirecting NO-IP DDNS requests to Wi-Fi settings by using local IP addresses for internal access and configuring port forwarding.

Manually Editing DNS-IP Correspondance Table with DNS Service

Resolve how to manually map domains to IPs by editing the hosts file or configuring a local DNS server like Dnsmasq.

Using Custom Domains and Multiple Localhost Ports for Applications

Resolve localhost CORS issues and simplify debugging by mapping custom domains to specific ports using the hosts file and Nginx reverse proxy.

Understanding DNS Server 'end::1' - A Basic Tech Support Question

Resolve confusion regarding the non-standard 'end::1' notation by identifying it as a typo for the IPv6 loopback address ::1 and clarifying its role in local DNS resolution.

Can DNS Name Resolve to Class EIP in Tech Support Sites?

Prevents misconfiguration errors by clarifying that DNS cannot resolve to reserved Class E IP addresses.

Solving Sequoia Split DNS Lookup Issue on macOS System

Resolve macOS Sequoia external DNS lookup failures caused by misconfigured split DNS routing internal queries to corporate servers.

Troubleshooting Internet Modem: Inability to Resolve Local IPv6 Hosts

Resolve local IPv6 host name resolution failures by verifying connectivity, correcting DNS settings, and disabling DoH conflicts.

Can WSL 2 be opened without relying on the DNS Client service?

Resolve WSL 2 network failures and slow DNS caused by the mandatory Windows DNS Client service dependency.

DNS Spoofing Still Fails: Extensive Troubleshooting for Wireless LAN Issues

Resolve DNS spoofing on wireless LANs by verifying encryption, enabling DNSSEC, and detecting rogue access points.

Configuring RADHCPv6 to Provide DNS Servers: A Tech Support Guide

Resolve IPv6 DNS configuration failures by configuring odhcpd to provide DNS servers instead of relying on non-standard radhcpv6 or ignored RA options.

Creating an Internal Connection between DNS, WireGuard, and Traefik using Docker

Resolve internal Docker container hostnames for WireGuard clients via Traefik and CoreDNS without leaking queries to public DNS.

Apache Reverse Proxy: Reroute URL to Docker Container in Local Network

Configure Apache to route external URLs to internal Docker containers using mod_proxy and VirtualHost directives for secure, centralized access.

Solving rDNS Not Forward Confirmed and x.x.x.x.in-addr.arpa Looks Like Generic Errors

Fixes rDNS not forward confirmed and generic PTR record errors by aligning reverse DNS with forward DNS to prevent mail server rejections.

Setting Up Custom DDNS Sub-domain for Synology NAS

Configure a custom DDNS sub-domain on Synology NAS to enable reliable remote access using a personalized domain name instead of generic services.

Is There Such a Thing as DNS Proxy?

A DNS proxy centralizes name resolution to enforce security policies, filter malicious domains, and optimize performance through caching.

DynDNS to Server on Home Network is Slow From Same Network

Resolve slow DynDNS access from the same network by configuring split-horizon DNS to bypass NAT loopback overhead.

Windows 11: Solving DNS Drops and Failures

Resolve Windows 11 DNS drops and failures by flushing the cache, resetting network adapters, adjusting IPv6 settings, switching to public DNS servers, or updating drivers.

Understanding Proxy DNS and Another DNS Domain: An Essential Tech Support Guide

Resolve confusion between proxied and non-proxied DNS modes to balance security, performance, and visibility.

Fixing DNS Issues When Moving Headless Ubuntu 22.04.5 LTS Server to a New Network

Resolve DNS failures on headless Ubuntu 22.04 after network migration by updating Netplan and clearing systemd-resolved cache.

Troubleshooting React/Express on Nginx/Ubuntu: Fixing 521 Bad Gateway Error

Resolve Nginx 521 Bad Gateway errors by verifying Express.js is running, listening on the correct port and interface, and accessible via local curl tests.

Unable to resolve DNS manually

Resolve manual DNS failures by verifying network adapter settings, flushing the local cache, and testing connectivity with nslookup.

Enabling Home Network Access with WireGuard and FRITZ!Box using DynDNS

Resolve FRITZ!Box lack of native WireGuard support by offloading VPN termination to a Linux device and configuring port forwarding via DynDNS.

CentOS Stream 9: Frequent 'Nameserver Not Known' Issue

Resolve the 'Nameserver Not Known' error in CentOS Stream 9 by fixing DNS configuration issues caused by NetworkManager and systemd-resolved sync failures.

Upgrading Network Infrastructure: Ideas for SSL VPN Connected Sites

Eliminate SSL VPN bottlenecks and DDNS instability by implementing site-to-site IPsec tunnels with static IPs for resilient multi-site connectivity.

Making DNSmasq Handle Dynamic IP Hostnames

Resolve dynamic IP hostnames in DNSmasq by combining static mappings with DHCP lease tracking for consistent local name resolution.

Router Accessible by Local Devices but Not from the Internet Using Its DDNS Hostname

Resolve remote router access failures by verifying DDNS IP resolution, configuring correct port forwarding rules, and bypassing ISP port blocking.

Why Are My DNS Requests Being Redirected by My ISP?

Resolve ISP DNS redirection by enabling DNS-over-HTTPS or DNS-over-TLS to encrypt queries and bypass network-level interception.

Migrating Email from ISP Business Domain to Tucows DNS: Changing MX Records for POP3/IMAP

Resolve lost incoming email by updating MX records in Tucows DNS to point to the new provider during ISP business domain migration.

Do Root TLD DNS Servers Always Respond with IP Addresses and Additional Records?

Explains why root and TLD DNS servers return delegation records instead of IP addresses.

Laptop Cannot Connect to Websites: DNS Probe Finished NXDOMAIN, 403 Error

Resolve DNS Probe Finished NXDOMAIN and 403 errors by flushing the local DNS cache, resetting network adapters via Command Prompt, and verifying browser proxy settings.

Unable to Access SQL Servers from Host Machine: DNS Issue

Resolve host-to-VM SQL server connectivity failures caused by DNS resolution errors in VMware environments.

Is it possible to have a DNS NS record point to a domain from outside the queried nameserver's domain?

Resolve DNS delegation errors when configuring NS records to point to external nameservers outside the queried domain.

Bind9 Equivalent to Dnsmasq's Resolv-File Option

Configure BIND9 forwarders to replicate Dnsmasq resolv-file behavior for upstream DNS resolution.

Possible DNS Server Not Set: How to Check and Fix It?

Fix the Possible DNS Server Not Set error by verifying network adapter settings, flushing the local DNS cache, and ensuring the DNS Client service is running.

DNS Settings with external hosted domain

Resolve domain routing errors by configuring nameservers, A records, and MX records to connect an external domain to a web host.

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