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Configure NGINX as the HTTPS edge, keep the public certificate and private key there, and place an upstream pool behind it. NGINX terminates the client TLS session on port 443, selects a backend, and forwards the request with proxy_pass. The second connection can be ordinary HTTP inside a trusted network or HTTPS when the hop to the application servers must also be encrypted.
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This design gives one public endpoint while distributing requests across multiple application instances. It can improve resource utilization, throughput, latency, and fault tolerance, but only when certificate handling, forwarded headers, upstream trust, and operational checks are configured deliberately.
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Understand the traffic flow before changing NGINX
A client resolves app.example.com to the address of NGINX and starts a TLS handshake on port 443. NGINX presents the certificate for that hostname, uses the private key to complete the handshake, decrypts the HTTP request, and chooses one server from the configured upstream group. NGINX then opens a separate connection to that server.
With proxy_pass http://app_backend;, the backend connection is plain HTTP. TLS protects the internet-facing leg only. With proxy_pass https://app_backend;, NGINX creates an encrypted connection to the selected backend as well. That is re-encryption, not reuse of the original client TLS session: there are two independent TLS sessions and NGINX is the endpoint of both.
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The F5 NGINX HTTP Load Balancing guide describes balancing across application instances as a way to optimize resource utilization, maximize throughput, reduce latency, and improve fault tolerance. Those are design goals, not guaranteed performance figures; the guides do not publish a universal throughput or latency improvement.
Prerequisites and a safe rollout plan
Confirm the NGINX build
Use a build that contains the HTTP SSL module. The open-source module reference notes that a source build may require --with-http_ssl_module. Check the running binary before deploying a configuration that uses listen 443 ssl:
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nginx -V 2>&1 | tr ' ' 'n' | grep http_ssl_modulePackage names and service commands differ by operating system. Keep the existing configuration backed up and know how to restore it before making changes.
Prepare the backend applications
- Give each application server a stable address and listening port, such as
10.0.0.11:8080and10.0.0.12:8080. - Permit connections from the NGINX host or its security group to those ports.
- Make sure the application can interpret the original host, client address, and protocol from forwarded headers.
- Decide whether sessions are stateless. If sessions are stored only in local memory, requests moving between servers may require persistence or a shared session store.
Obtain and protect the edge certificate
Obtain a certificate whose names cover the public hostname, along with its private key and any required intermediate certificates. A controlled internal environment can use an internally generated certificate, but public clients will normally need a certificate issued by a trusted certificate authority.
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Store the certificate chain and key outside the web root. The certificate may be broadly readable by the NGINX master process, but the private key is sensitive. Use restrictive ownership and permissions, allow the NGINX master process to read it, and prevent unrelated users or services from reading it. Test permissions after every renewal or deployment; a correct path with an unreadable key causes NGINX to fail its configuration test or reload.
Build the basic HTTP-upstream configuration
The following pattern places an upstream pool and a client-facing HTTPS server in the http context of nginx.conf or an included file. Replace the addresses, hostname, and certificate paths with values for your environment.
http {
upstream app_backend {
server 10.0.0.11:8080;
server 10.0.0.12:8080;
}
server {
listen 443 ssl;
server_name app.example.com;
ssl_certificate /etc/nginx/tls/app.example.com/fullchain.pem;
ssl_certificate_key /etc/nginx/tls/app.example.com/privkey.pem;
ssl_protocols TLSv1.2 TLSv1.3;
location / {
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto https;
proxy_pass http://app_backend;
}
}
}What each part does
| Directive | Purpose |
|---|---|
upstream app_backend |
Names the backend pool. Each server line adds an address and port to that pool. |
listen 443 ssl |
Accepts HTTPS on port 443 and enables TLS for this server block. |
server_name |
Selects this virtual server for the requested hostname and participates in certificate/SNI selection. |
ssl_certificate |
Points to the public certificate chain sent to clients. |
ssl_certificate_key |
Points to the private key used for the public TLS session. |
ssl_protocols |
Limits negotiated TLS versions to the explicitly listed protocols. |
proxy_set_header |
Preserves the original host, client address, proxy chain, and HTTPS scheme for the application. |
proxy_pass http://app_backend |
Sends the request to the named pool over HTTP. NGINX chooses a member using the pool’s balancing method. |
Do not add a URI suffix to proxy_pass casually. A value such as proxy_pass http://app_backend; preserves the location’s request URI, while a value with a trailing path changes URI replacement behavior. Keep the simple form unless your application explicitly needs path rewriting.
Redirect port 80 to HTTPS
If the site should not serve application traffic over HTTP, add a separate listener that redirects clients:
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server {
listen 80;
server_name app.example.com;
return 301 https://$host$request_uri;
}This redirect does not terminate TLS; it only moves an HTTP client to the HTTPS endpoint. Do not use it as a substitute for opening port 443 and installing a valid certificate.
Choose how NGINX distributes requests
Round robin is the default when no balancing directive is specified. NGINX sends successive requests across the listed servers, making it a sensible starting point when instances have similar capacity and requests take roughly similar time.
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| Method | Configuration | When it fits | Important qualification |
|---|---|---|---|
| Round robin | No extra directive | Similar servers and broadly similar request duration | It does not account for an individual request’s current cost. |
| Least connections | least_conn; inside the upstream |
Requests have uneven duration or some clients hold connections open | Connection count is only a proxy for work; a long-running request can still be more expensive than several short ones. |
| Least time | Available in NGINX Plus | Workloads where observed response time should influence selection | Requires the Plus feature set. |
| Slow start and session persistence | Available in NGINX Plus | Warming a recovered server gradually or keeping a client tied to an instance | Persistence can create uneven load and should not replace shared session storage when that is practical. |
For least-connections balancing, the upstream begins like this:
upstream app_backend {
least_conn;
server 10.0.0.11:8080;
server 10.0.0.12:8080;
}Start with round robin, observe request duration and connection behavior, and switch only when the workload justifies it. The official guidance does not provide a numeric threshold at which one method universally wins.
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Validate, reload, and verify the path
- Check syntax and referenced files. Run
nginx -t. A successful result should report that the syntax is okay and the test is successful. Fix every error before reloading. - Reload without dropping existing connections. Use the service manager appropriate to the host, commonly
systemctl reload nginx, or send NGINX a reload signal through the host’s established operational procedure. - Check the certificate externally. Connect to the public hostname and port 443 with a TLS-capable client, verify that the expected certificate chain is presented, and confirm that the negotiated protocol is allowed by your policy. Test the hostname, not merely the IP address, so SNI is exercised.
- Send an application request. Request a known endpoint through
https://app.example.com/and inspect the application logs for the expected host and forwarded protocol. - Confirm both members receive traffic. Use distinct response headers or server logs temporarily, then send enough requests to observe the selected backends. This is an operational check, not a claim that a particular distribution is guaranteed for every client or connection pattern.
- Test failure behavior. Stop or isolate one backend in a controlled window, send requests, and verify that the remaining member responds as expected. Restore the member and confirm it can serve again before ending the test.
Re-encrypt the upstream connection with HTTPS
Use HTTPS on the second leg when traffic crosses an untrusted network, policy requires encryption in transit everywhere, or the backend itself must authenticate the proxy. Change the upstream target to https:// and configure certificate validation rather than disabling it.
http {
upstream app_backend_tls {
server app-1.internal.example:8443;
server app-2.internal.example:8443;
}
server {
listen 443 ssl;
server_name app.example.com;
ssl_certificate /etc/nginx/tls/app.example.com/fullchain.pem;
ssl_certificate_key /etc/nginx/tls/app.example.com/privkey.pem;
ssl_protocols TLSv1.2 TLSv1.3;
location / {
proxy_set_header Host app.internal.example;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto https;
proxy_ssl_server_name on;
proxy_ssl_name app.internal.example;
proxy_ssl_trusted_certificate /etc/nginx/tls/internal-ca.pem;
proxy_ssl_verify on;
proxy_ssl_verify_depth 2;
proxy_pass https://app_backend_tls;
}
}
}Make upstream certificate validation match the design
proxy_ssl_trusted_certificateidentifies the CA bundle NGINX should trust for backend certificates, including a private CA.proxy_ssl_verify onmakes NGINX reject an untrusted backend certificate instead of silently accepting it.proxy_ssl_server_name onsends SNI to the backend. This matters when several certificates or virtual hosts share an address.proxy_ssl_namesupplies the name used for certificate verification and SNI. It must match the backend certificate’s intended name and trust model.
Do not “fix” an upstream certificate error by turning verification off. Install the correct CA chain, correct the backend name, or replace the backend certificate. If the backend requires mutual TLS, add a client certificate and key:
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proxy_ssl_certificate_key /etc/nginx/tls/client-key.pem;Protect these client-key files with the same care as the public edge private key. Mutual TLS proves NGINX is an authorized client; it does not replace server-certificate validation.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Forward the client identity safely
The example sets X-Real-IP, appends the existing chain to X-Forwarded-For, and declares the original scheme with X-Forwarded-Proto https. Configure the application framework to trust these headers only when they come from your NGINX address or an explicitly trusted proxy network. Otherwise, a direct attacker could submit forged forwarding headers.
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Use $host rather than an unvalidated client-supplied value when preserving the public host. If the upstream virtual host is different from the public name, set Host to the backend name deliberately and document that mapping, as in the re-encryption example.
Tune TLS and protect key material
NGINX 1.23.4 and later document TLS 1.2 and TLS 1.3 as defaults. Older releases and distributions may differ, so explicitly review ssl_protocols during deployment. The example allows only TLS 1.2 and TLS 1.3; compatibility requirements may require a separate, documented decision.
- Keep the private key readable by the NGINX master process and inaccessible to ordinary users.
- Separate certificate renewal from key distribution, and re-run
nginx -tafter replacing either file. - Use the complete certificate chain where clients need intermediates.
- Monitor certificate expiration and test renewal before the current certificate expires.
- For upstream TLS, maintain the internal CA bundle and backend names as part of deployment configuration.
Support more than one HTTPS site with SNI
For several hostnames, create a server block for each site or use a carefully designed shared block. Each hostname needs a certificate whose names cover it. Modern clients send Server Name Indication (SNI), allowing NGINX to choose the matching certificate; clients that do not send the expected name can receive the default server’s certificate.
Keep the certificate and key directives with the server block that owns the hostname, and test each hostname separately. A certificate valid for one site does not automatically make another site’s TLS endpoint valid.
Common failures and precise fixes
| Symptom | Likely cause | Fix |
|---|---|---|
nginx -t reports an unknown ssl directive |
The build lacks the HTTP SSL module. | Install a package or build that includes the module; source builds may need --with-http_ssl_module. |
| NGINX cannot load the certificate key | Wrong path, malformed PEM, or restrictive permissions that exclude the master process. | Check the file paths, PEM contents, ownership, and permissions, then run nginx -t again. |
| Clients see a certificate for another site | Incorrect server_name, missing SNI from the test client, or the wrong default server. |
Test with the hostname, inspect the matching server blocks, and ensure the certificate covers that name. |
| 502 Bad Gateway | Backend is stopped, unreachable, listening on another port, or speaking a different protocol. | Connect from the NGINX host to the backend address and port, inspect NGINX error logs, and ensure http:// versus https:// matches the service. |
| Upstream TLS verification fails | Missing private CA, name mismatch, expired certificate, or absent SNI. | Install the correct trusted CA, set proxy_ssl_name, enable SNI, and renew or replace the backend certificate. |
| The application records NGINX’s address as the client | Forwarded headers are missing or the application does not trust the proxy. | Set the forwarding headers and configure the application to trust only the NGINX network. |
| Requests appear stuck to one backend | Long-lived keep-alive connections, a client-side connection pattern, persistence, or too little test traffic. | Inspect connection and request logs, test with multiple clients, and choose a balancing method that matches request duration. |
| Reload fails after certificate renewal | The new key is unreadable or the certificate and key do not match. | Restore the previous valid pair, correct permissions or files, verify the pair, and reload only after nginx -t succeeds. |
Open-source NGINX and NGINX Plus design choices
Open-source NGINX provides the basic reverse-proxy and load-balancing pattern shown here, including round robin and least-connections selection. NGINX Plus adds documented capabilities such as least time, slow-start, and session persistence. Select the edition based on the operational behavior you need rather than assuming a more advanced algorithm automatically improves every workload.
Regardless of edition, keep health and deployment procedures explicit. Verify that a failed instance is removed from useful service according to the behavior your edition and configuration provide, and perform controlled failure tests after changes.
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Production checklist
- DNS points the public hostname to the NGINX edge.
- Port 443 is reachable and the certificate names match the hostname.
- The private key and any upstream client keys have restricted permissions.
- The TLS protocol policy is explicit and reviewed for the installed NGINX version.
- The upstream pool contains reachable application addresses and correct ports.
proxy_passuses HTTP or HTTPS intentionally.- Forwarded headers are configured and trusted only from NGINX.
- Upstream TLS validation uses the correct CA, name, and SNI settings.
nginx -tsucceeds before every reload.- External handshake, application request, distribution, and backend-failure checks have been performed.
- Certificate renewal, key rotation, log monitoring, and rollback procedures are documented.
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