Getting Started
Getting Started with Viglar
Set up your first domain, verify ownership, configure monitoring and alerts, and optionally enable DMARC report collection.
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Knowledge Base
Practical guides for website owners, developers and anyone responsible for keeping a website online.
Website Monitoring
What Is Website Monitoring?
Learn what website monitoring checks, why it matters, and how it can detect downtime, SSL problems, DNS changes and security issues early.
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Email Authentication
What Are SPF, DKIM and DMARC?
Understand how SPF, DKIM and DMARC work together to authenticate email sent using your domain and detect unauthorized use.
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SSL/TLS
What Is SSL Certificate Monitoring?
Learn what SSL certificate monitoring checks, why certificate expiry is only part of the problem, and how external TLS checks can detect configuration issues early.
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HTTP Security
What Are HTTP Security Headers?
Learn how HTTP security headers help browsers enforce security controls and which headers are worth checking on a website.
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Website Monitoring
What Is Uptime Monitoring?
Learn how uptime monitoring detects unreachable websites, HTTP errors and response problems, and why an external check is different from monitoring your own server.
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Website Monitoring
What Is Website Content Monitoring?
Learn how content monitoring detects meaningful website changes, why dynamic pages create challenges, and how unexpected changes can reveal deployment or security problems.
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Domain Security
What Is Domain Hijacking?
Learn what domain hijacking is, how unauthorized transfers and registrar changes happen, what domain owners should monitor, and how to react to suspicious changes.
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Domain Security
What Is Domain Monitoring?
Learn how domain monitoring tracks registration data, expiration, registrar changes, nameservers and other domain-level signals.
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Reputation
What Is IP Reputation Monitoring? Blocklists Explained
IP reputation monitoring checks whether a server IP address appears on public reputation databases and blocklists - and helps you investigate problems before they affect your site or email.
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Ports
What Is Open Port Monitoring? Why Exposed Ports Matter
Learn what open ports are, how external port scanning works, what open, closed and filtered states mean, and why unexpected exposed services deserve attention.
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Website Monitoring
Website Incident Timeline
Learn how to connect monitoring incidents, detected changes, and recovery events to investigate website issues.
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Website Monitoring
What Are Maintenance Windows?
Learn how scheduled maintenance windows help manage planned downtime, reduce unnecessary alerts and preserve website monitoring history.
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