checkstyle does not take into account proxy settings from settings.xml

I've been hesitating wether to report it as bug or as improvement, but at the moment I'd rate it as a bug.
It took me quite some time to figure out why this was going wrong.
In my settings.xml I've defined our company proxysettings. These settings are used by Maven when connecting to the remote repository.

However when using the checkstyle plugin as part of the site generation I can not obtain our checkstyle.xml which is available via http.
I found a solution by adding the following parameters on the command line when continuum launches maven:
-Dhttp.proxyHost=myproxy -Dhttp.proxyPort=80

Wouldn't it be possible for the maven checkstyle plugin to use the settings defined in settings.xml, so I've only to define those once?

FYI the error generated:
[INFO] Generate "Dependencies" report.
[INFO] Generate "Issue Tracking" report.
[INFO] Generate "Project License" report.
[INFO] Generate "Mailing Lists" report.
[INFO] Generate "Source Repository" report.
[INFO] Generate "Project Team" report.
[INFO] Generate "Maven Surefire Report" report.
[INFO] Generate "Checkstyle" report.
[INFO] ------------------------------------------------------------------------
[ERROR] BUILD ERROR
[INFO] ------------------------------------------------------------------------
[INFO] Error during report generation

Embedded error: Unable to find configuration file location.
http://spirou.mycompany.be/javadev/install/checkstyle/mycompany-checkstyle-1.5.xml
[INFO] ------------------------------------------------------------------------
[INFO] Trace
org.apache.maven.lifecycle.LifecycleExecutionException: Error during report generation
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:559)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalWithLifecycle(DefaultLifecycleExecutor.java:475)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:454)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:306)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:273)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:140)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:322)
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:115)
at org.apache.maven.cli.MavenCli.main(MavenCli.java:256)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315)
at org.codehaus.classworlds.Launcher.launch(Launcher.java:255)
at org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430)
at org.codehaus.classworlds.Launcher.main(Launcher.java:375)
Caused by: org.apache.maven.plugin.MojoExecutionException: Error during report generation
at org.apache.maven.plugins.site.SiteMojo.execute(SiteMojo.java:389)
at org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:412)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:534)
... 16 more
Caused by: org.apache.maven.reporting.MavenReportException: Unable to find configuration file location.
at org.apache.maven.plugin.checkstyle.CheckstyleReport.getConfigFile(CheckstyleReport.java:879)
at org.apache.maven.plugin.checkstyle.CheckstyleReport.executeReport(CheckstyleReport.java:466)
at org.apache.maven.reporting.AbstractMavenReport.generate(AbstractMavenReport.java:98)
at org.apache.maven.plugins.site.SiteMojo.generateReportsPages(SiteMojo.java:802)
at org.apache.maven.plugins.site.SiteMojo.execute(SiteMojo.java:301)
... 18 more
Caused by: java.io.FileNotFoundException: http://spirou.mycompany.be/javadev/install/checkstyle/mycompany-checkstyle-1.5.xml
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:789)
at java.net.URL.openStream(URL.java:913)
at org.codehaus.plexus.util.FileUtils.copyURLToFile(FileUtils.java:876)
at org.apache.maven.plugin.checkstyle.Locator.resolveLocation(Locator.java:99)
at org.apache.maven.plugin.checkstyle.CheckstyleReport.getConfigFile(CheckstyleReport.java:870)
... 22 more
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 48 seconds
[INFO] Finished at: Thu May 18 17:54:23 CEST 2006
[INFO] Final Memory: 20M/38M
[INFO] ------------------------------------------------------------------------