Скачать или смотреть Solving the Negotiate Authentication Error in Gradle Behind a Proxy for MarkLogic Data Hub Upgrade

Encountering a `Negotiate Authentication Error` while upgrading to MarkLogic Data Hub via Gradle behind a proxy? Find out how to resolve it by configuring Kerberos settings correctly!
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Tackling the Negotiate Authentication Error in Gradle Behind a Proxy

When attempting to upgrade the MarkLogic Data Hub using Gradle, users may face a frustrating issue where the process fails due to a Negotiate authentication error. Specifically, the error message indicates an Invalid name provided (Mechanism level: KrbException: cannot locate default realm). This can leave you wondering how to proceed, especially when you're operating behind a proxy. Let’s break down the solution step-by-step to help you get your upgrade on track.

Understanding the Problem

In your case, you're running Gradle commands on a Redhat 7.6 Linux system with Gradle version 4.10 and attempting to connect to the internet through a web proxy. Although you have set the necessary proxy configurations in the gradle.properties file, you're still encountering authentication errors related to Kerberos.

Common Error Output

During the execution of the command:

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You may see output similar to this:

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This suggests that there might be an underlying issue with the Kerberos configuration rather than with Gradle or MarkLogic itself.

Diagnosing the Kerberos Configuration

The key to resolving the Negotiate authentication error often lies in ensuring that your Kerberos configuration is accurately set up in the /etc/krb5.conf file. Below are common steps and configurations to check.

Step-by-Step Fix

Open the Kerberos Configuration File:
You need to ensure that your Kerberos configuration properly matches the domain of your proxy server. Check the following configuration section:

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Ensure that the domains in this section accurately reflect your actual domain and the proxy server address. This is crucial for Kerberos to authenticate against those realms.

Verify Proxy Address:
The proxy address must also be resolvable to a valid DNS name. If the Kerberos configuration cannot locate the proxy host's address, the negotiation will fail.

Testing Configuration:
After making changes, it’s a good idea to validate the configuration. Try testing Kerberos authentication manually or using the following command to check if you can obtain a ticket:

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Replace <your-username> with your actual username. If this command is successful, it indicates that your Kerberos setup is working correctly against the specified domain realm.

Additional Considerations

Gradle Version Compatibility:
You mentioned using an older version of Gradle (4.10). While upgrading Gradle may offer some improvements and fixes, it’s essential to check your production environment compatibility before making the leap to a newer version.

Proxy Credentials:
Ensure that the credentials (username and password) in your gradle.properties file are correctly formatted. Sometimes, issues related to slashes (/, \) or quotes may cause additional confusion.

Testing from Other Applications:
Since you successfully accessed the internet using Firefox, it indicates that the credentials and proxy settings generally work. This helps to narrow down the issue more toward the Kerberos configuration.

Conclusion

If you're experiencing a Negotiate authentication error while attempting a Gradle upgrade for MarkLogic, it’s likely due to a misconfiguration in your Kerberos settings rather than with Gradle or MarkLogic itself. By carefully reviewing your /etc/krb5.conf configurations and ensuring proper domain-to-realm mappings, you should be able to resolve thi