Why Does My Java Application Still Show 'Unable to Verify Server Certificate' After Importing the Certificate?

Unable to Verify Server Certificate: Troubleshooting and Resolution

Problem Description:

When attempting to establish a secure connection with a server using Java, an error message may be encountered: "unable to find valid certification path to requested target."

Possible Cause and Solution:

After importing the server's self-signed certificate into the cacerts trust store, the error persists. This suggests that the Glassfish server might not be accessing the correct cacerts file.

Troubleshooting Steps:

1. Set Debugging Properties: Execute the following command:

   java -Djavax.net.debug=all -Djavax.net.ssl.trustStore=trustStore ...

   Replace "trustStore" with the actual filepath of the trust store that contains the server's certificate.

2. Examine Debug Output: Check the debug output for clues regarding which trust store is being used. Key words to look for include "TrustStore:" and "Certificate Chain."
3. Verify Trust Chain: Ensure that the server's certificate has a valid trust chain that extends to a trusted root certificate in the cacerts trust store.
4. Restart Server: Restart the Glassfish server after making any changes to the cacerts file or debugging properties.
5. Alternative Trust Store Location: Consider verifying that the Glassfish server is using the expected cacerts file location by checking the server's JVM startup arguments or configuration settings.

Additional Notes:

• The keystore contains the private key and certificate used by the server to verify its identity.
• The trust store contains certificates of trusted authorities that the client uses to verify the server's certificate.
• The server's certificate may need to be reimported into the correct cacerts file if the file was modified or the server was reconfigured.

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