---
title: ToolRouter — Workflow
description: A multi-tool workflow showing how to combine ToolRouter tools for a complex task.
url: https://toolrouter.com/workflows/certificate-monitoring
---
# Certificate Monitoring

Monitor SSL/TLS certificates for expiration, verify TLS configuration, and confirm domain ownership alignment.

Certificate-related outages and security incidents are preventable with proactive monitoring. Expired certificates cause service disruptions, weak cipher configurations expose traffic to interception, and certificates issued to the wrong entity can indicate domain hijacking or man-in-the-middle attacks.

This workflow monitors the full certificate lifecycle: checking certificate validity and expiration timelines, verifying TLS protocol and cipher configuration against current security standards, and confirming that domain registration aligns with certificate issuance. Regular monitoring catches issues weeks before they become incidents.

**Tools:** dns-domain, security-httpx, whois-rdap
**Category:** security

## Steps

### 1. Check Certificate Status

Inspect SSL/TLS certificates for validity, expiration timeline, issuer trust chain, and certificate transparency logs.

- **Tool:** dns-domain
- **Skill:** check_ssl
- **Input:** Domains to check certificate status for.
- **Output:** Certificate details including expiration date, issuer, SANs, chain validity, and CT log entries.

### 2. Verify TLS Configuration

Probe endpoints to verify TLS protocol versions, cipher suites, and HSTS configuration meet security standards.

- **Tool:** security-httpx
- **Skill:** probe_hosts
- **Input:** HTTPS endpoints to verify TLS configuration.
- **Output:** TLS version support, cipher suite details, HSTS status, and protocol security assessment.

### 3. Verify Domain Ownership

Confirm domain registration details to ensure certificates are issued to the legitimate domain owner.

- **Tool:** whois-rdap
- **Skill:** lookup_domain
- **Input:** Domain name to verify ownership for.
- **Output:** Domain registration details including registrant, registrar, and domain lock status.

## Benefits

- Prevent certificate expiration outages with advance warning
- Ensure TLS configuration meets current security standards
- Detect unauthorized certificate issuance through ownership verification
