Apache needs two things for OCSP stapling: SSLUseStapling On and a mandatory SSLStaplingCache. Nginx needs ssl_stapling on;, a working resolver, and (when verification is enabled) a trust file containing the issuer, root, and intermediate certificates. In both servers, the certificate chain, DNS and outbound access to the certificate authority’s OCSP responder, cache state, and the live TLS handshake determine whether a response is actually stapled.
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This guide gives separate Apache and Nginx procedures, explains where each directive belongs, and shows how to verify the result from outside the server. Directive availability and defaults vary with the installed web-server and OpenSSL versions, and a certificate authority can change its responder URL. Check the deployed certificate’s Authority Information Access (AIA) extension before rollout.
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What OCSP stapling changes in a TLS connection
Online Certificate Status Protocol (OCSP) lets a client ask a certificate authority whether a certificate has been revoked. Without stapling, a browser or other TLS client may have to contact the authority during connection setup. With stapling, the web server periodically obtains a signed OCSP response and sends that response to the client during the TLS handshake. The client can then evaluate the certificate status without making a separate request to the authority.
The server does not invent the responder address. It reads the OCSP URL advertised in the certificate’s AIA extension, resolves that hostname, reaches the responder, and retains a response until it needs to refresh it. A valid certificate chain and a reachable responder are therefore prerequisites; enabling a directive alone does not guarantee that the handshake will contain a response.
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Apache and Nginx implement the same TLS feature with different configuration models:
| Area | Apache (mod_ssl) | Nginx |
|---|---|---|
| Enable stapling | SSLUseStapling On |
ssl_stapling on; |
| Response storage | A configured shared-memory SSLStaplingCache is mandatory. |
Nginx fetches and manages responses internally; an optional ssl_stapling_file can supply a DER response from disk. |
| DNS requirement | Resolver behavior follows the host’s normal resolver setup. | A resolver directive should be specified so the OCSP responder hostname can be resolved. |
| Stapling verification | Controlled by mod_ssl and its certificate chain. | ssl_stapling_verify on; uses certificates configured with ssl_trusted_certificate. |
| Primary configuration scope | Cache is global; stapling is normally enabled globally and can be overridden in a virtual host. | Directives belong in the relevant http or server context. |
Prepare the certificate and network first
Confirm that the certificate advertises an OCSP responder
Inspect the certificate installed on the server and locate its AIA OCSP entry. For a PEM certificate file, a commonly available OpenSSL check is:
openssl x509 -in certificate.pem -noout -ocsp_uriThe returned hostname and URL are the destination the server must reach. If no OCSP URI is present, there is no responder endpoint for stapling to use; replacing or reissuing the certificate is a certificate-management decision, not an Apache or Nginx setting.
Assemble a usable chain
The server certificate normally needs its issuing intermediate certificates in the file presented to clients. An incomplete chain can prevent clients from building trust and can also prevent stapling validation. Keep the leaf certificate first, followed by the required intermediates, in the file referenced by Nginx’s ssl_certificate. Apache’s certificate and chain directives vary by installed version and distribution, so use the chain layout expected by that installation.
For Nginx verification, prepare a separate trust file containing the server certificate’s issuer, the root certificate, and every required intermediate certificate. The Nginx module documentation specifically requires those certificates to be trusted through ssl_trusted_certificate when stapling verification is enabled.
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Allow DNS and outbound HTTP
The server must resolve the responder hostname and make outbound HTTP connections to it. Firewall policy, an HTTP proxy requirement, a blocked egress path, or a resolver that cannot answer the hostname can leave the server running while no response is stapled. Test from the same host and network namespace used by the web-server workers, not only from an administrator workstation.
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Record the software versions
Directive support and defaults depend on the installed Apache or Nginx release and the linked OpenSSL library. Record those versions before changing production configuration and consult the matching mod_ssl or Nginx module documentation. Certificate authorities can also change responder URLs and operational behavior, so re-check AIA data when certificates are renewed.
Configure OCSP stapling on Apache
1. Enable stapling and create the mandatory cache
At global SSL configuration scope, add both directives:
SSLUseStapling On
SSLStaplingCache shmcb:/var/run/ocsp(32768)Apache’s mod_ssl documentation is explicit: “Configuration of a cache is mandatory for OCSP stapling.” The shmcb provider creates a shared-memory cache; /var/run/ocsp is an example path and 32768 is the example cache size shown above, not a universal capacity recommendation.
Use the cache location supplied by your operating system or Apache build. Debian/Ubuntu, Red Hat-family systems, source builds, and other layouts place global SSL settings and runtime directories in different locations. The directory or shared-memory target must be available to the Apache parent process and remain present across restarts according to the distribution’s runtime-directory rules.
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2. Put the directives in the right scope
Keep SSLStaplingCache in the global server configuration, where all eligible virtual hosts can use it. Enable stapling globally with SSLUseStapling On when most HTTPS virtual hosts should staple. A virtual host can opt out with:
SSLUseStapling OffUse that override only for a host that should not staple. A host that remains enabled still needs a certificate with an OCSP responder and a chain Apache can validate.
3. Treat responder and cache controls as tuning, not substitutes
mod_ssl exposes controls for responder timeout, standard and error cache lifetimes, maximum response age, clock-skew handling, and responder-error behavior. The relevant settings include SSLStaplingResponderTimeout, SSLStaplingStandardCacheTimeout, SSLStaplingErrorCacheTimeout, SSLStaplingResponseMaxAge, SSLStaplingFakeTryLater, and SSLStaplingReturnResponderErrors. Change these only when you have a defined operational reason and have checked the documentation for your installed version. A longer cache lifetime cannot repair a missing responder URL, a broken chain, or a cache that never initialized.
4. Validate and reload without dropping connections
- Run the configuration checker supplied by your Apache installation, commonly
apachectl configtestor the distribution’s equivalent. - Correct syntax, path, permission, and module errors before touching the live service.
- Perform a graceful reload using the service manager or Apache control command used by your distribution. A graceful reload lets existing connections finish while new handshakes use the new settings.
- Allow the server to contact the responder and populate the cache before judging the result. An immediately restarted process may not yet have a cached response.
Configure OCSP stapling on Nginx
1. Enable stapling and configure a resolver
In the applicable http or server context, add:
ssl_stapling on;
resolver 1.1.1.1 1.0.0.1 valid=300s;Nginx states that a resolver directive should be specified to resolve the OCSP responder hostname. The addresses above are example recursive resolvers; use resolvers permitted by your network and security policy. valid=300s controls how long Nginx may cache a DNS answer in this example and should match your operational requirements.
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2. Supply the trust material used for verification
Enable verification and point Nginx at a trust bundle:
ssl_stapling_verify on;
ssl_trusted_certificate /etc/nginx/tls/ca-chain.pem;The trust file must contain the issuer of the server certificate, the root certificate, and all required intermediate certificates. It is not merely the public certificate sent to clients. If the file omits an intermediate or contains an unrelated chain, Nginx may fetch a response but reject it during verification.
3. Present a complete client chain
Configure ssl_certificate with the server certificate followed by the intermediates needed by clients. Keep the verification bundle used by ssl_trusted_certificate conceptually separate: one file is the chain presented in the handshake, while the other is the trust material Nginx uses to validate the stapled response.
4. Use a stapling file only when you intentionally manage the response
Nginx also supports ssl_stapling_file. When this option is used, the file must contain DER output produced by the openssl ocsp command. This is an alternative to Nginx fetching the response itself; it adds a process for obtaining, renewing, replacing, and permissioning the file. If that process leaves an expired or missing file, the handshake will not have a usable response.
5. Test and reload
- Run
nginx -tand resolve every reported path, syntax, certificate, and permission error. - Gracefully reload Nginx through the service manager or the control command used by your installation.
- Confirm that worker processes can resolve and reach the responder and can read the trust bundle.
- Allow a fetch to complete, then inspect a new TLS handshake from a client outside the server.
Verify the response in a real TLS handshake
Use OpenSSL against the public endpoint
Apache’s SSL/TLS how-to recommends the OpenSSL command-line program for checking whether an OCSP response is sent. A typical check is:
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openssl s_client -connect example.com:443 -statusReplace example.com:443 with the public host and port. In the output, look for an OCSP response section and a successful response status. Running the command against the public name matters: testing a backend address, a different virtual host, or a TLS-terminating load balancer can inspect a different certificate and configuration.
Separate configuration errors from an empty cache
A syntactically valid configuration can still produce no response while the cache is cold. Repeat the handshake after a reasonable interval and inspect the web-server error log. On Apache, look for cache initialization and responder errors. On Nginx, look for resolver failures, trust-chain failures, and errors opening certificate or stapling files. A response that appears intermittently often indicates cache expiry, responder reachability, or multiple front ends with inconsistent configuration.
Troubleshoot a missing stapled response
| What you observe | Likely cause | Checks and corrective action |
|---|---|---|
| No OCSP section in the OpenSSL handshake | Stapling is disabled, the wrong virtual host answered, or no response has been fetched yet. | Confirm the requested hostname, enable the directive in the effective configuration, perform a graceful reload, and check logs after allowing cache initialization. |
| Apache starts but never staples | SSLStaplingCache is absent, points to an unusable path, or cannot be initialized. |
Add the mandatory global cache, use the distribution’s valid runtime path, check permissions, and inspect Apache startup and SSL logs. |
| Nginx logs resolver errors | No usable resolver is configured, or workers cannot reach the configured DNS servers. |
Set resolver in the effective http/server context and test DNS reachability from the worker environment. |
| Nginx fetches but rejects the response | ssl_stapling_verify is enabled but ssl_trusted_certificate lacks the issuer, root, or an intermediate. |
Rebuild the trust bundle with the complete required chain and verify the file path and permissions. |
| Clients report chain or trust problems | The file presented by ssl_certificate omits an intermediate or is ordered incorrectly. |
Place the leaf certificate first and append the intermediates required by clients; do not assume the separate trust bundle is sent to clients. |
| Responder connection failures | Outbound HTTP is blocked, the AIA URL is stale, or the responder is temporarily unavailable. | Read the certificate’s current AIA URL, test DNS and outbound access from the server, and review firewall or proxy policy. Recheck the URL after certificate renewal. |
A response was configured with ssl_stapling_file but is absent or rejected |
The file is missing, unreadable, expired, or not DER output from openssl ocsp. |
Regenerate the DER response, install it at the configured path with worker-readable permissions, and establish a renewal process. |
| Only some clients or hosts show stapling | Different virtual hosts, front ends, certificates, or server versions are serving the name. | Test each public hostname, compare effective configurations and certificate chains, and verify every TLS terminator in the connection path. |
Apache and Nginx operational differences
Apache’s mandatory shared cache
Apache’s most important implementation distinction is that stapling is not complete without SSLStaplingCache. The cache is a global resource, while SSLUseStapling can be enabled or disabled per virtual host. A cache-path mistake can therefore affect several sites at once.
Nginx’s explicit resolver and trust store
Nginx makes two dependencies visible in configuration: the resolver used to find the responder and the trust bundle used to verify the response. This is convenient for controlled environments, but it also means a configuration copied between networks may fail if its DNS servers are unreachable or its trust file does not match the deployed certificate chain.
Certificate files serve different purposes
Both servers need a chain that clients can build. Nginx additionally distinguishes the chain sent in ssl_certificate from the certificates trusted for stapling verification in ssl_trusted_certificate. Treating those as interchangeable is a common source of verification errors.
A rollout checklist
- Read the deployed certificate’s AIA extension and record the OCSP URL.
- Confirm DNS resolution and outbound HTTP access from the web-server host or worker network.
- Verify that the client-facing certificate file contains the leaf and required intermediates.
- For Apache, configure a valid global
SSLStaplingCacheand enableSSLUseStapling On. - For Nginx, enable
ssl_stapling on;and configure a reachableresolver. - For Nginx verification, configure
ssl_stapling_verify on;and a completessl_trusted_certificatebundle. - Run the server’s configuration test before reloading.
- Gracefully reload, allow the cache or fetch process to initialize, and inspect error logs.
- Use OpenSSL against each public hostname and verify that the handshake contains a current OCSP response.
- Repeat the checks after certificate renewal, DNS changes, firewall changes, or migration to another TLS terminator.
Bottom line
On Apache, start with the mandatory shared cache and then enable stapling in the appropriate virtual hosts. On Nginx, start with the stapling directive, a resolver that workers can reach, and a trust bundle containing the issuer, root, and intermediates. In either server, only a live handshake test proves delivery; configuration syntax by itself does not.
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