About

The SSL Configuration Diff tool compares two TLS configuration snapshots and highlights the exact differences between them. It shows which cipher suites were added or removed, which protocol versions changed, and any modifications to security headers or certificate settings. This is essential for validating configuration changes and detecting unauthorized modifications.

The diff output is formatted as a clear side-by-side comparison with additions highlighted in green and removals in red, making it easy to understand exactly what changed between two configuration states.

How to Use

1Take a baseline snapshot of your current TLS configuration
2Make your configuration changes and take a second snapshot
3Run the diff comparison between the two snapshots
4Review the highlighted differences and verify only intended changes were made

Use Cases

•Change Validation: Verify that TLS configuration changes only modified what was intended
•Unauthorized Change Detection: Identify unexpected configuration modifications that may indicate compromise
•Migration Verification: Confirm server migrations preserved the exact TLS configuration
•Audit Evidence: Document configuration changes for compliance audits and change management records
•Drift Detection: Identify gradual configuration drift across servers in a load-balanced cluster

How The Comparison Works

Two hosts serving the same site should look identical from outside. This page connects to both and reports the fields that differ.

1Gather the same facts from each host — protocol version, cipher suite, key length, certificate subject, issuer and validity — so the comparison is like for like.
2Report only what differs, field by field with both values side by side. That is the useful output during a migration: a field that matches needs no attention, and one that differs is either expected or a bug.
3Score the similarity as a proportion of matching fields, so you can see at a glance whether the two deployments are equivalent or diverging.

Both connections are independent, so a difference can come from load balancer choice rather than configuration. Where that is possible, run the comparison more than once before treating a single field as meaningful.

Tips & Best Practices

•Always take a snapshot before and after any TLS configuration change
•Store baseline snapshots in version control for complete change history
•Run diffs as part of your pre-deployment validation process
•Compare snapshots from multiple servers to detect configuration drift

Technical Details

●Comparison Scope: Protocols, cipher suites, certificate details, security headers, key parameters

●Output Format: Side-by-side diff with color-coded additions and removals

●Granularity: Individual cipher suite level comparison with security impact analysis

●Export: JSON diff data and human-readable report formats

Frequently Asked Questions

If the diff shows changes you did not make, investigate immediately. Check server access logs, review recent deployments, and verify the server has not been compromised. Unexpected TLS changes could indicate unauthorized access, misconfigured automation, or configuration drift from other teams.

Yes, you can compare any two snapshots regardless of which server they came from. This is useful for verifying that multiple servers in a cluster share identical configurations, or for comparing your configuration against a hardened reference.

The diff compares at the individual cipher suite level, protocol version level, and header level. For example, it will show if AES-128-GCM was replaced with AES-256-GCM, or if TLS 1.0 was disabled. Each change includes the security implication of the modification.

For migrations and for drift. During a migration you need to know whether staging behaves like production before you cut over, and the certificate, protocol and cipher facts are the ones that break quietly. Afterwards it catches drift — one host upgraded, one server block left behind, one certificate renewed on a single node — which is the class of problem nobody notices until a user hits the unlucky node.

Not automatically. Different hardware, different load balancer software or a different termination path can produce different suites from identical intentions, since the cipher is chosen by whatever terminates the connection. What matters is whether either value is one you want in production. Where both are acceptable suites, the difference is usually benign and not worth chasing.

Because the two hosts are serving different certificates at the moment you check, which is expected mid-change. What the comparison gives you is confirmation that the new certificate is the one you intended and covers the right names. Run it after the migration completes to see the two converge — a persistent difference afterwards is what signals an incomplete cutover.

That the two hosts differ on several observable fields at once, which usually means they are not configured the way you assumed rather than that something is subtly wrong. The field list is the real output; the score is a summary for a dashboard. Read which fields differ before deciding whether the number matters.

Yes, and the differences are usually instructive. An edge presents its own certificate and may negotiate different ciphers, so several fields will differ by design. What you are looking for is whether the edge's certificate covers the hostname correctly and whether the protocol is what you intended — not whether the two match.

SSL/TLS Configuration Diff Tool

Configuration Differences

Summary