How a ten-year-old dangling DNS record handed one of our subdomains to spammers
On August 27, Google sent us an email. We did not. We barely recognized the hostname. None of us had thought about dev-docs.trackjs.com in about ten years.
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Best DNS Monitoring Tools in 2026 [24 Analyzed]
The best DNS monitoring tools are Hyperping for fast DNS checks with on-call and a status page, Oh Dear for authoritative nameserver comparison and change history, Site24x7 for DNSSEC and global locations inside a suite, UptimeRobot for inexpensive DNS checks next to HTTP, and DNS Spy for dedicated DNS security and WHOIS. I analyzed 24 current products and shortlisted five. Every tool below can query DNS on a schedule and alert when the answer is missing or wrong.
How to Fix DNS Server Not Responding Errors and Keep Users Online
Has your service desk ever filled with "the internet is down" tickets while every switch, firewall and uplink is reporting normal? The connection is usually fine. What has failed is name resolution, and the message your users see says the DNS server is not responding.
Moving Your Business Website: How to Avoid Email and Hosting Disruption
Website migration from one host to another is more than copying a few files to another server. A website might depend on databases, e-mail accounts, DNS records, SSL certificates, sub-domains, and other external applications that should continue to function after migration. Proper planning ensures the safety of the information and eliminates any risk of losing access to emails or having people visit a partially transferred website. This can be achieved by preparing the new hosting in advance.
How Does DNS Work? A Complete Guide to the DNS Protocol
Discover how the DNS protocol translates domain names into IP addresses, how DNS lookups chain through resolver servers, and how to read a DNS packet.
Stale DNS Glue Records: How to Diagnose Parent-Authoritative Mismatches
Your authoritative servers return the right IP, but users still hit the old one. Here’s how to find stale glue records and fix the parent-zone referral.
Monitor HTTPS and SVCB Records with DNS Check
DNS Check now supports monitoring HTTPS records and SVCB records, DNS record types 65 and 64, both standardized in RFC 9460. They tell a client how to connect to a service rather than only where it is: which HTTP versions the endpoint speaks, which port it listens on, which addresses it can start connecting to, and which keys it needs for Encrypted ClientHello, all before it opens a connection.
Proofpoint outage on August 14, 2026: DNS failure disrupts email worldwide
A DNS failure at Proofpoint broke email delivery for organizations around the world on August 14, 2026. Records for pphosted.com stopped resolving, so inbound and outbound mail routed through Proofpoint bounced or stalled for nearly four hours. StatusGator flagged the incident with an Early Warning Signal at 12:48 UTC, about an hour before Proofpoint acknowledged it publicly on its status page at 13:50 UTC. Here is what happened, who it hit, and how some teams kept mail moving.
DNS Alerts over Syslog: TLS, CEF, and a Straight Line to Your SIEM
Enterprise teams can now add a Syslog alert channel: every DNS Spy alert delivered as an RFC 5424 message over TLS (or TCP/UDP), formatted as JSON or ArcSight CEF, with syslog priorities mapped from real alert severity. All deliveries originate from one documented static IP, so getting through your collector's firewall is a single allowlist rule.
Simplified Guide on How to Clear DNS Server Cache on Windows
Sites often try to record information about visitors, which is why you’re often asked if you accept the use of cookies. When users want to remove the information collected, they clear the cache of their browsers. What many people don’t realize, though, is information is also stored in the domain name server (DNS) cache. This guide will explain in more detail what the cache is, how it’s used, and why it’s important to sometimes flush the DNS server cache.