Use TLS Server Name Indication (SNI) to serve different HTTPS certificates for multiple hostnames on one Lighttpd IP address. Enable mod_openssl on the :443 socket, configure a deliberate default certificate, then override ssl.pemfile and ssl.privkey inside a $HTTP["host"] block for each additional hostname.
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How Lighttpd chooses a certificate
SNI is a TLS extension that lets a client send the hostname it wants during the TLS handshake. Lighttpd reads that name and can select the certificate associated with the hostname before serving the HTTPS request. This is what allows several domains to share one IP address and TCP port 443.
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A shared-IP configuration still needs one certificate at the socket level. That certificate is the fallback for clients that do not send SNI and for SNI names that do not match one of your host conditionals. Choose it deliberately; it should represent the most important site or a certificate that safely explains the mismatch.
The normal arrangement is:
- A
$SERVER["socket"] == ":443"block enables TLS and defines the default certificate. - One
$HTTP["host"]conditional is added for every other hostname. - Each conditional points to the certificate chain and private key for that hostname.
The browser sends the hostname through SNI, Lighttpd selects the matching certificate, and the request then continues through the ordinary virtual-host configuration.
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Requirements and planning
Check the Lighttpd version
The official Lighttpd references document the ssl.* directives in mod_openssl from Lighttpd 1.4.46 onward. The separate ssl.privkey directive is documented as available from 1.4.53. Check the installed version before using the examples:
lighttpd -vIf the installed release is older, the key may need to be included in the PEM file instead of being supplied through ssl.privkey. Use the SSL reference that matches the installed release rather than assuming newer inheritance or certificate-refresh behavior exists.
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List every name users can enter, including apex and www variants. A certificate for example.org does not automatically cover www.example.org, and the reverse is also true unless both names are included in the certificate’s Subject Alternative Name (SAN) list.
| Hostname | Certificate file | Private-key file | Configured as |
|---|---|---|---|
default.example |
/etc/lighttpd/ssl/default.example.pem |
/etc/lighttpd/ssl/default.example.key |
Fallback in the :443 socket |
www.example.org |
/etc/lighttpd/ssl/www.example.org/fullchain.pem |
/etc/lighttpd/ssl/www.example.org/privkey.pem |
SNI host conditional |
mail.example.org |
/etc/lighttpd/ssl/mail.example.org/fullchain.pem |
/etc/lighttpd/ssl/mail.example.org/privkey.pem |
SNI host conditional |
Keep private keys readable only by the account that must load them. The Lighttpd process needs read access, but ordinary users should not. Store certificates and keys in a consistent directory layout so renewals do not require rewriting the configuration.
Configure the shared HTTPS socket
1. Load the OpenSSL module
Add mod_openssl to the module list if it is not already loaded:
server.modules += ("mod_openssl")Do not add a second copy if your distribution already loads the module elsewhere. Duplicate module entries are unnecessary and can make configuration maintenance confusing.
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2. Define TLS and the default certificate
Create or edit the HTTPS socket block. The following is the basic Lighttpd pattern:
server.modules += ("mod_openssl")
$SERVER["socket"] == ":443" {
ssl.engine = "enable"
ssl.pemfile = "/etc/lighttpd/ssl/default.example.pem"
ssl.privkey = "/etc/lighttpd/ssl/default.example.key"
}ssl.engine = "enable" turns on TLS for this socket. ssl.pemfile identifies the certificate material, while ssl.privkey identifies the private key when it is stored separately. The default PEM and key must exist and be readable before Lighttpd can start or reload this configuration.
3. Add a certificate override for each hostname
Place a host conditional for every additional name:
$HTTP["host"] == "www.example.org" {
ssl.pemfile = "/etc/lighttpd/ssl/www.example.org/fullchain.pem"
ssl.privkey = "/etc/lighttpd/ssl/www.example.org/privkey.pem"
}
$HTTP["host"] == "mail.example.org" {
ssl.pemfile = "/etc/lighttpd/ssl/mail.example.org/fullchain.pem"
ssl.privkey = "/etc/lighttpd/ssl/mail.example.org/privkey.pem"
}Use the exact hostname spelling that appears in the request. If you intend to support both an apex name and a www name, either issue one certificate containing both SANs or create separate host conditionals with the appropriate certificate for each.
Complete example
Combining the socket and conditionals gives a compact multi-certificate configuration:
server.modules += ("mod_openssl")
$SERVER["socket"] == ":443" {
ssl.engine = "enable"
ssl.pemfile = "/etc/lighttpd/ssl/default.example.pem"
ssl.privkey = "/etc/lighttpd/ssl/default.example.key"
}
$HTTP["host"] == "www.example.org" {
ssl.pemfile = "/etc/lighttpd/ssl/www.example.org/fullchain.pem"
ssl.privkey = "/etc/lighttpd/ssl/www.example.org/privkey.pem"
}
$HTTP["host"] == "mail.example.org" {
ssl.pemfile = "/etc/lighttpd/ssl/mail.example.org/fullchain.pem"
ssl.privkey = "/etc/lighttpd/ssl/mail.example.org/privkey.pem"
}Keep the default certificate in the socket block even when every expected browser sends SNI. It is required for SNI-less clients and is also the certificate a client receives when its requested name has no matching conditional.
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Build certificate files correctly
Certificate chain order
ssl.pemfile must contain the server certificate and, when applicable, the intermediate certificates in the correct order. With an ACME-issued certificate, fullchain.pem is normally the appropriate value for ssl.pemfile: it contains the leaf certificate followed by the intermediate chain.
A missing intermediate can produce browser warnings even though the leaf certificate is valid. Do not substitute a CA bundle containing unrelated roots, and do not reverse the order of the leaf and intermediate certificates.
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Separate or combined private keys
When the private key is not inside the PEM file, specify it with ssl.privkey. The certificate and key must belong together. If they do not match, Lighttpd may fail to start, fail to reload, or present unusable TLS credentials.
Older configurations may place the private key and certificate in one PEM file. That arrangement is different from the separate-file example above; use one consistent format supported by the installed Lighttpd release.
Names must match the request
Certificate validation is based on the requested hostname, not merely on the IP address. Confirm that every certificate’s SAN list contains the exact name users will request, including capitalization-insensitive but otherwise exact labels such as www.example.org versus example.org. A wildcard certificate also has defined scope; for example, a wildcard for *.example.org does not cover the bare example.org name.
Use Let’s Encrypt and handle renewals
Lighttpd’s official how-to documents Certbot and Let’s Encrypt. The documented file mapping uses privkey.pem for ssl.privkey and fullchain.pem for ssl.pemfile. A representative HTTPS socket is:
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server.modules += ("mod_openssl")
$SERVER["socket"] == "0.0.0.0:443" {
ssl.engine = "enable"
ssl.privkey = "/etc/letsencrypt/live/www.example.com/privkey.pem"
ssl.pemfile = "/etc/letsencrypt/live/www.example.com/fullchain.pem"
ssl.openssl.ssl-conf-cmd = ("MinProtocol" => "TLSv1.2")
}The documented OpenSSL setting establishes TLS 1.2 as the minimum protocol for that example. Apply it only when it matches your compatibility policy and the Lighttpd/OpenSSL versions installed on the server.
HTTP-01 validation requirement
Certbot’s HTTP-01 challenge requires the hostname to answer the challenge on port 80. Ensure DNS points the name to this server, the firewall permits port 80, and Lighttpd (or the validation setup) routes the challenge path correctly. HTTPS-only redirection or a different service on port 80 can prevent issuance even when port 443 is configured perfectly.
Reload after renewal
Certificate files in the Let’s Encrypt live directory change when a renewal occurs, but the running daemon must reload or restart according to your deployment process before it uses the new material. After every renewal, verify the certificate currently presented on port 443 rather than assuming the file change was picked up automatically.
Validate the configuration before and after reload
- Confirm the module: check the active configuration and verify that
mod_opensslis loaded. - Check syntax: run Lighttpd’s configuration test for the file used by your service, for example
lighttpd -tt -f /etc/lighttpd/lighttpd.conf. Correct any parse error before touching the running daemon. - Check the socket: verify that the
:443block containsssl.engine = "enable"and a readable defaultssl.pemfile. - Check each conditional: compare every
$HTTP["host"]spelling and path with the hostname-to-certificate map. - Check the chain and key: inspect each PEM and confirm that the private key matches its leaf certificate.
- Reload safely: reload or restart Lighttpd using the service manager for your operating system, then check the service status and logs.
- Test each SNI name: connect separately with each hostname and inspect the presented certificate and chain.
- Test the fallback: request an unknown hostname and use an SNI-less client test to confirm that the intended default certificate appears.
- Test issuance routing: if using Certbot HTTP-01, request the challenge path over port 80 and confirm it reaches the expected webroot or handler.
Testing with OpenSSL
OpenSSL can send a chosen SNI name and display the certificate returned by Lighttpd:
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Testing with curl
When DNS is not ready or you need to force a particular address, curl can map a hostname to an IP while retaining the hostname used for TLS and HTTP:
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curl --resolve www.example.org:443:203.0.113.10 https://www.example.org/ -vThe verbose output shows the TLS handshake and helps distinguish a certificate-selection problem from an application or virtual-host problem.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Troubleshoot the common failure modes
The wrong certificate appears for a known hostname
- Confirm the client is sending SNI; an old client or a deliberately SNI-less test receives the default.
- Check the hostname in the
$HTTP["host"]conditional character for character, includingwww. - Verify that the request reaches the intended Lighttpd instance and IP address rather than a load balancer or another server.
- Reload the daemon after changing certificate files or configuration.
Lighttpd will not start or reload
- Run the configuration test and fix syntax errors first.
- Check that every referenced path exists and is readable by the Lighttpd process.
- Check that the private key matches the certificate and that the PEM is not truncated.
- Confirm the installed version supports the directives used, especially
ssl.privkey.
Browsers report an incomplete chain
Replace a leaf-only file with the correctly ordered full chain in ssl.pemfile. The server certificate must come first, followed by the required intermediate certificates. Test the live endpoint after reloading; inspecting a local file alone does not prove Lighttpd is serving it.
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Let’s Encrypt validation fails
- Verify DNS for the hostname resolves to this server.
- Open port 80 and ensure the HTTP-01 challenge is not blocked by a firewall, redirect loop, or unrelated virtual host.
- Confirm the challenge request is routed to the location Certbot expects.
- After successful renewal, reload Lighttpd and retest the live certificate.
Unknown names receive an unexpected certificate
This is expected behavior when no host conditional matches: Lighttpd uses the socket’s default certificate. Change the default if that fallback is inappropriate, or add a conditional for the legitimate hostname. An unmatched request cannot select a certificate that has not been configured.
SNI compared with separate IP addresses
| Consideration | SNI on one IP | Separate IP per domain |
|---|---|---|
| Client compatibility | Requires the client to send a hostname in the TLS handshake; SNI-less clients receive the default certificate. | Works with clients that do not send SNI because each certificate is bound to its own address and socket. |
| Address use | Several hostnames share one IP and port 443, conserving IPv4 addresses. | Consumes an additional address for each independently bound domain. |
| Certificate selection | Uses the socket default plus $HTTP["host"] overrides. |
Binds a certificate directly to each separate $SERVER["socket"] block. |
| Failure behavior | An omitted or unmatched SNI name receives the deliberate default certificate. | The client reaches the certificate assigned to the destination address. |
| Operational trade-off | Scales efficiently but requires careful hostname conditionals and fallback testing. | Can support legacy clients but increases address allocation and socket management. |
For modern public HTTPS sites, SNI is usually the practical choice because it avoids assigning one IPv4 address to every certificate. Separate addresses remain useful when compatibility with non-SNI clients is a hard requirement or when an installation needs strict address-level separation.
Operational checklist
- Keep one deliberate default certificate in the
:443socket. - Use one host conditional per additional hostname and keep names consistent with DNS and certificates.
- Use a full chain in every
ssl.pemfilewhere intermediates are required. - Protect private keys and verify Lighttpd can read them.
- Check the Lighttpd version before relying on
ssl.privkeyor newer certificate-refresh behavior. - Run a syntax check before every reload.
- Test every hostname with SNI, then test an unknown name and an SNI-less connection.
- If using Certbot HTTP-01, preserve working port-80 challenge routing.
- Reload or restart after renewal and inspect the certificate served by the running daemon.
What happens when a client does not send SNI?
The client cannot identify a hostname during the TLS handshake, so Lighttpd has no name to use for a conditional certificate. It returns the certificate configured directly on the :443 socket. This is why the default certificate is not optional and why it should be selected with the fallback case in mind.
Can one certificate cover several hostnames?
Yes, a single certificate can list multiple names in its SAN extension, and a wildcard can cover names within its permitted scope. That does not remove the need to configure the names users actually request: Lighttpd still needs the appropriate host routing, and every name must be included in the certificate’s validated name set. Use separate conditionals when different hostnames have independently issued certificates.
The Bottom Line
Enable mod_openssl, configure a valid default certificate on the shared :443 socket, and override the certificate and key in a $HTTP["host"] block for each hostname. Validate SNI selection, chain order, fallback behavior, and renewal reloads before putting the configuration into production.
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