Site deployment doesn't work with file://\\shareddir

<distributionManagement>
<repository>
<id>repo</id>
<name>Repo</name>
<url>file://\\vsrigel\maven-proxy</url>
</repository>
<site>
<id>intranet</id>
<name>Intranet</name>
<url>file://\\podjp\classes\sitesdev</url> <!-- \\podjp\classes is a shared dir-->
</site>
</distributionManagement>

Site deployment doesn't seem to work for me with this url. When I try mvn site:deploy, i get nothing in the url destination, although I get the following output in my dos command :
[INFO] [site:deploy]
file://\\podjp\classes\sitesdev/test-common - Session: Opened
file://\\podjp\classes\sitesdev/test-common - Session: Disconnecting
file://\\podjp\classes\sitesdev/test-common - Session: Disconnected
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESSFUL

Please note that if I use <url>file://c:/classes/sitesdev</url>, it does work.