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SSL/TLS Configuration Migration Tool

Convert SSL/TLS configurations between different web server formats

Migrated Configuration

About

The SSL Configuration Migration tool helps you migrate TLS configurations between different web servers and platforms. It converts configurations between Nginx, Apache, HAProxy, and IIS formats, ensuring that security settings are preserved correctly during the migration process.

Server migrations are high-risk operations where TLS misconfigurations can cause security vulnerabilities or service outages. This tool automates the conversion process, translating cipher suite names, protocol directives, and certificate references between server-specific formats while maintaining equivalent security settings.

How to Use

  1. 1Select your source server type (Nginx, Apache, HAProxy, or IIS)
  2. 2Paste or upload your current TLS configuration
  3. 3Select the target server type you are migrating to
  4. 4Click "Convert" and review the generated configuration with migration notes

Use Cases

What The Translation Covers

nginx and Apache name the same TLS concepts differently. This page translates between them, and is explicit about where the translation is only approximate.

  1. 1Map the six directives that carry across cleanly — protocol list, cipher list, server cipher preference, session timeout, session cache and OCSP stapling. Each maps to its counterpart in the other server, and each substitution is reported individually so you can see what was changed.
  2. 2List the changes made, in order, rather than presenting only the output. A migration you cannot audit is a migration you cannot trust, and seeing each substitution makes the result reviewable before it goes anywhere near a server.
  3. 3Say plainly when a combination is not supported. Anything other than an nginx-to-Apache or Apache-to-nginx pair produces an explicit statement that direct migration is not supported, rather than a plausible-looking translation that would not work.

Directives are renamed, not reinterpreted. Certificate paths, virtual host structure and anything else that differs in meaning between the servers stays as written and needs manual review before the configuration is used.

Tips & Best Practices

  • •Always test converted configurations in a staging environment before applying to production
  • •Review the migration notes for any settings that cannot be directly converted
  • •Verify certificate and key file paths are correct for the target server
  • •Test the converted configuration with SSL Labs after deployment

Technical Details

●Supported Formats: Nginx ssl_* directives, Apache SSLEngine/SSLCipherSuite, HAProxy ssl, IIS bindings
●Cipher Mapping: OpenSSL cipher strings mapped to server-specific format names
●Protocol Mapping:** SSLProtocol (Apache) mapped to ssl_protocols (Nginx) and ssl-min-version (HAProxy)
●Validation:** Post-conversion syntax validation and security equivalence check

Frequently Asked Questions

Most TLS settings have direct equivalents across servers, but some are platform-specific. The tool flags settings that cannot be directly converted and provides alternative approaches. For example, OCSP stapling configuration differs significantly between Nginx and Apache.
Yes, the tool supports bidirectional migration between all supported server types. You can convert from Nginx to Apache, Apache to HAProxy, or any other combination. The conversion maintains security equivalence even when the syntax differs.
Custom modules like Nginx ssl_stapling or Apache mod_ssl specific features are converted where equivalents exist. The tool notes any features that are not directly available in the target platform and suggests alternatives.
A starting point, not a finished file. Directive names are translated, which removes the most tedious and error-prone part of a migration, but structure does not translate: nginx server blocks and Apache virtual hosts differ in ways no rename can capture, and certificate paths, certificate locations and OCSP responder settings all need checking by hand. Treat the result as a draft to review rather than something to deploy.
Because the two are not the same kind of thing. nginx and Apache are both general-purpose HTTP servers whose TLS directives correspond closely, so a rename maps meaningfully between them. HAProxy has a different model entirely — a proxy with explicit bind and backend structure rather than virtual hosts — so a mechanical translation would produce something that reads plausibly and does not work. Saying so is more useful than inventing it.
Certificate paths and the cipher selection. Paths differ between distributions and are often absolute in one server and relative in the other, and a cipher expression valid in one may select an entirely different set in the other because the underlying library differs. Both produce failures that are obvious on testing, which is why testing the syntax and then verifying externally is worth the step.
The directive name is translated and reported as changed, but whether stapling then works is a separate question entirely. It depends on the certificate chain being complete, the responder being reachable and the server being able to serve the response. Enable it deliberately and verify with the stapling page, because a translated directive that fails silently leaves you without the protection you enabled it for.
Migrate when the two configurations are doing the same job, since the translation saves real effort and preserves intent. Rewrite when the original configuration has accumulated enough cruft that understanding it is harder than starting again — which is common with inherited configs nobody has touched in years. The honest test is whether you can explain every line of what you are migrating; if not, a clean rewrite is usually less work than debugging the old one.

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