The Tool Desk
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What you need before editing Tomcat
Have these items ready:
- A certificate whose subject alternative name (SAN) contains the public hostname clients will use.
- The matching private key and the complete certificate chain.
- Either a Java keystore (JKS or PKCS#12) or separate PEM certificate, chain and private-key files.
- Access to the Tomcat installation and the value of
$CATALINA_BASE. On installations that separate binaries from instance data, use the instance’sconfdirectory, not an unrelated$CATALINA_HOME/confdirectory. - A plan for the listening port. Tomcat examples commonly use
8443;443is also valid, but operating systems generally restrict ports below 1024 to privileged processes or require a service-specific setup.
For production, use a certificate issued by a publicly trusted certificate authority (CA). A self-signed certificate is useful for proving that the connector is wired correctly in a lab, but browsers and other clients will warn until the issuing certificate is explicitly trusted.
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Choose where TLS and redirects will be handled
There are two separate design decisions: where the TLS handshake ends, and which HTTP requests should redirect.
| Deployment choice | Certificate material | Redirect behavior | Important consideration |
|---|---|---|---|
| Tomcat terminates TLS directly | Java keystore or PEM files read by Tomcat | redirectPort can upgrade requests that match a Servlet security-constraint |
Tomcat owns the certificate, private key and HTTPS listener. |
| Reverse proxy or load balancer terminates TLS | Certificate is installed at the edge; Tomcat may remain HTTP-only | The edge can return a permanent redirect for every HTTP URL | Forwarded scheme, host and port must be represented correctly to Tomcat. |
| Tomcat and an edge both use TLS | Certificates are required at each TLS termination point | Redirect policy normally belongs at the edge | Use this only when encryption is also required between the proxy and Tomcat. |
Tomcat supports the JSSE and OpenSSL TLS implementations. NIO and NIO2 connectors can use either implementation; APR/native uses OpenSSL. Use the connector syntax documented for the Tomcat version and implementation installed on your server rather than copying an old, incompatible snippet.
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Prepare a keystore or PEM files
Option A: Java keystore
Import the private key, server certificate and intermediate certificates into a JKS or PKCS#12 keystore. PKCS#12 is commonly used for modern Java deployments. The private-key entry must contain the certificate chain in the correct order: the server certificate first, followed by its issuing intermediates. Protect the file and its password; anyone who obtains both can impersonate the hostname.
A lab-only PKCS#12 keystore can be generated with keytool:
keytool -genkeypair
-alias tomcat
-keyalg RSA
-keysize 2048
-validity 365
-storetype PKCS12
-keystore conf/localhost.p12
-storepass changeit
-dname "CN=localhost"This creates a self-signed certificate and therefore is not suitable for a public production hostname. Replace the example password and file location, and use a CA-issued certificate for production.
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Option B: PEM certificate and key
If your certificate authority supplies PEM files, keep the server certificate, intermediate chain and private key as separate, permission-restricted files. The exact Tomcat attributes differ from keystore configuration, so use the installed version’s connector reference when assigning the certificate, chain and key paths. Do not paste a PEM private key into a world-readable directory.
Add the HTTPS connector in server.xml
Back up $CATALINA_BASE/conf/server.xml before editing it. A modern keystore-based connector has this structure:
<Connector port="8443"
protocol="org.apache.coyote.http11.Http11NioProtocol"
SSLEnabled="true">
<SSLHostConfig>
<Certificate certificateKeystoreFile="conf/localhost.p12"
certificateKeystorePassword="changeit"
type="RSA" />
</SSLHostConfig>
</Connector>The important pieces are SSLEnabled="true", an SSLHostConfig, and a Certificate. In this example, conf/localhost.p12 is resolved relative to the Tomcat base directory. Use an absolute path if your deployment requires one, but keep the file outside publicly served application content.
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Certificate attributes vary between keystore and PEM files and between Tomcat releases. Check the connector reference for the exact version in use before adding options for protocols, ciphers, aliases or key passwords. A syntactically valid fragment from another release can still fail at startup.
Using port 443
Change port="8443" to port="443" when clients must use the standard HTTPS port directly. On many Unix-like systems, binding below 1024 requires elevated privileges or a service configuration that grants the Java process permission to bind that port. Running the entire application as an unrestricted administrator is not a substitute for a carefully designed service account or edge proxy.
Keep the HTTP connector and set redirectPort
Leave a cleartext connector enabled when you need Tomcat to receive HTTP requests or when an edge device forwards HTTP internally. Set its redirectPort to the HTTPS listener, for example:
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<Connector port="8080"
protocol="org.apache.coyote.http11.Http11NioProtocol"
connectionTimeout="20000"
redirectPort="8443" />redirectPort is conditional, not global. Catalina consults it when an HTTP request matches a Servlet security constraint that requires confidential transport. It does not redirect every URL merely because the attribute is present. This distinction explains why an unprotected page may continue to load over HTTP.
Make application-controlled redirects with a Servlet security constraint
To have Tomcat upgrade protected resources, declare a constraint in the web application’s deployment descriptor. The following example requires confidential transport for every URL in that application:
<security-constraint>
<web-resource-collection>
<web-resource-name>Entire application</web-resource-name>
<url-pattern>/*</url-pattern>
</web-resource-collection>
<user-data-constraint>
<transport-guarantee>CONFIDENTIAL</transport-guarantee>
</user-data-constraint>
</security-constraint>- Place the constraint in the application’s
WEB-INF/web.xml, or express the equivalent rule through the framework that owns deployment descriptors. - Deploy the updated application and make sure the HTTP connector’s
redirectPortmatches the externally reachable HTTPS port. - Request an HTTP URL that matches the constraint. Tomcat should return a redirect to the configured secure port.
- Request an HTTP URL outside the constrained patterns. It may remain HTTP, because no matching requirement tells Tomcat to redirect it.
Use this mechanism when the application itself decides which resources require TLS. It is not a replacement for an edge-level policy when the requirement is “redirect every HTTP request.”
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Redirect every HTTP URL at a reverse proxy or load balancer
For a universal policy, configure the public edge listener to return a permanent redirect for HTTP and serve the request on HTTPS. A generic edge configuration follows this pattern:
HTTP listener on public port 80:
return 301 https://<original-host><original-uri>;
HTTPS listener on public port 443:
forward the original Host and URI to Tomcat
send the forwarded protocol as httpsPreserve the client’s Host and request URI so the redirect does not change the hostname or path. Forward the protocol information using the headers your proxy and Tomcat configuration expect, commonly a standardized forwarded-protocol header. A permanent redirect is cacheable; test the policy with a temporary redirect first if you are still correcting hostnames or paths.
When TLS ends at the proxy, Tomcat otherwise sees an HTTP connection and may generate incorrect absolute URLs, security decisions or additional redirects. Set proxy host and port metadata on the Tomcat connector, and configure the appropriate forwarded-header handling for your version and proxy. The public scheme must be represented as HTTPS and the public port as 443 (or your actual external port). Ensure the proxy overwrites, rather than blindly trusts, forwarded headers supplied by untrusted clients.
Restart and verify the complete path
- Validate the XML before restarting. An unclosed element or duplicate connector attribute prevents startup.
- Restart the Tomcat service so it rereads
server.xmland the certificate material. - Inspect startup logs for keystore path, password, certificate-chain and protocol errors. A connector that fails during initialization will not listen on its configured port.
- From a client that can resolve the public hostname, request
https://host:8443/, or the production HTTPS URL. Confirm that the certificate’s SAN matches the hostname and that the chain is trusted. - Request the same path over HTTP. If it matches a
CONFIDENTIALconstraint, verify the redirect location and secure port. If every path must redirect, test the edge listener rather than relying onredirectPort. - Check an application-generated absolute link, login callback and error page. These reveal proxy scheme or port metadata errors that a simple status-code check can miss.
Troubleshoot the failures that occur most often
“Keystore was tampered with” or a password error
- Confirm that the file is the intended JKS or PKCS#12 file and that the configured type matches it.
- Check whether the path is relative to the active
$CATALINA_BASE, not your shell’s current directory. - Verify the store password and, where applicable, the private-key password. Avoid leaving example values such as
changeitin production.
TLS handshake or trust failures
- Check SAN coverage for the exact hostname; a certificate for one name does not automatically cover another.
- Check that intermediates are present and ordered correctly after the server certificate.
- Determine whether the client trusts the issuing CA. A self-signed certificate will normally produce a browser warning.
- Confirm that the client and connector share a supported TLS implementation and protocol configuration for the installed Tomcat and Java versions.
HTTP reaches the application without redirecting
First determine whether the URL matches a Servlet security constraint requiring CONFIDENTIAL. If it does not, this is expected behavior: redirectPort alone is not a blanket redirect. Add or correct the constraint, or move the universal redirect to the edge proxy.
Redirect loop behind a proxy
The proxy may be forwarding HTTPS to Tomcat as HTTP, or Tomcat may be advertising its internal port instead of the public one. Align forwarded-protocol handling with the connector’s proxy host and port metadata. Then test both the first redirect and the final application URL, not just the browser’s cached result.
The browser still displays a warning
Replace the self-signed certificate with one chaining to a CA trusted by the affected clients, and serve the complete chain. Installing a certificate only on the server does not make an untrusted issuer trusted on every client.
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Security and maintenance checklist
- Keep private keys and keystores readable only by the Tomcat service account.
- Use a CA-issued certificate for production and track its expiration and renewal process.
- Do not expose the keystore password in shell history, public configuration repositories or application logs.
- Document whether TLS terminates at Tomcat, at the edge, or at both points.
- Record the public hostname, external HTTPS port and internal forwarding port so redirect and proxy settings can be reviewed together.
- After every certificate or connector change, test direct HTTPS, constrained HTTP URLs, universal edge redirects and application-generated absolute URLs.
Which configuration should you use?
| Requirement | Recommended arrangement |
|---|---|
| One Tomcat instance must serve HTTPS directly | Install a keystore or PEM files, add an SSL-enabled connector, and listen on 8443 or 443. |
| Only protected application resources must use HTTPS | Keep the HTTP connector, set redirectPort, and add CONFIDENTIAL security constraints. |
| Every HTTP request must become HTTPS | Redirect at the reverse proxy or load balancer and pass accurate host, URI and forwarded-protocol metadata to Tomcat. |
| Tomcat is behind an HTTPS-terminating proxy | Configure proxy metadata and forwarded-header handling so Tomcat calculates URLs and security state from the public HTTPS scheme and port. |
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