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There are several reasons why Maven may be unable to download certain dependencies, even when using a proxy:

1. Incorrect settings: If the proxy settings are not configured correctly, it may result in Maven not being able to download dependencies. Double-check the proxy settings in your Maven configuration to ensure they are correct.

2. Firewall rules: The firewall rules on the network may be blocking certain dependencies from being downloaded. Check with your network administrator to see if the necessary ports are open.

3. Private repositories: Some dependencies may be hosted in private repositories or require authentication to download. Check with the repository owner to see if this is the case and configure the authentication settings in your Maven configuration.

4. Outdated dependencies: If the dependencies are outdated or no longer supported, they may have been removed from the repository. Check the Maven repository for any updates or alternatives to the outdated dependencies.

5. Network issues: Network connectivity issues may result in Maven being unable to download dependencies. Check your network connection and try again later.

Overall, Maven may be unable to download certain dependencies due to a variety of reasons. It's important to investigate the root cause and take the necessary steps to resolve the issue.