Intellij Community can't use http proxy for Maven

1. Navigate to Maven > Importing¹. inside the IntelliJ IDEA Settings (which is found under File > Settings).

2. The second last option in Maven > Importing is a field named "VM options for importer". Append the following to whatever already exists there:

   -DproxySet=true -DproxyHost=myproxy.com -DproxyPort=3128

   Here, replace myproxy.com with your proxy server, (e.g. http://myproxyserver.com). Replace 3128 with your proxy port (e.g. 8080).

3. Do the same under Maven > Runner¹

4. Apply and close the settings window.

It should work now.

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¹ This may be nested under Build, Execution, Deployment > Build Tools >, depending on the version of IntelliJ you're using.

I had the same problem running maven inside IntelliJ whilst behind an NTLM proxy. The working solution was as follows:

1. Download and install CNTLM. Excellent post here on how to do this https://stackoverflow.com/a/23962313/3298801
2. Set and test your local proxy settings in IntelliJ via Settings >> System Settings >> HTTP Proxy.
3. In Intellij set the maven runner. Within Settings >> Maven >> runner set VM options to:
   -DproxySet=true -DproxyHost=localhost -DproxyPort=3132
4. Restart Intellij
5. Note within ~/.m2/settings.xml I also added my proxy config as:

<proxies>
        <proxy>
            <active>true</active>
            <protocol>https</protocol>
            <host>localhost</host>
            <port>3132</port> 
        </proxy>
</proxies>

A little update for memo. I don't have a standalone maven installed, so finally I fixed this by modifying the maven plugin settings. settings.xml is located at :

IntelliJ IDEA Community Edition 2017.3.4\plugins\maven\lib\maven3\conf\settings.xml

You can find proxy settings and change it as mentioned above.