What needs to be done to download a maven dependency in virtual desktop environment?

Question

I am not able to download the maven dependencies in a Virtual desktop environment. Even though I have set up the server details in my settings.xml file just keep on getting the following error. Error Msg: Could not resolve dependencies for project "sample project": Failed to collect dependencies at

<dependency>
    <groupId>org.testng</groupId>
    <artifactId>testng</artifactId>
    <version>7.5</version>
    <scope>test</scope>
</dependency>

Thank you.