Webradio : certains captent et d'autres non

SALUT,
J'ai créé une webradio avec le serveur Icecast et le logiciel My Radiomatisme.
J'ai un problème :
Certaines personnes peuvent l'écouter sans problème mais d'autres non...
Je pense que ça vient de mon serveur...
Voici la configuration de mon serveur :
(Désolé pour ce pavé mais je pense que le problème vient de là.)

- <icecast>
- <limits>
<clients>100</clients>
<sources>2</sources>
<threadpool>5</threadpool>
<queue-size>524288</queue-size>
<client-timeout>30</client-timeout>
<header-timeout>15</header-timeout>
<source-timeout>10</source-timeout>
- <!-- If enabled, this will provide a burst of data when a client
first connects, thereby significantly reducing the startup
time for listeners that do substantial buffering. However,
it also significantly increases latency between the source
client and listening client. For low-latency setups, you
might want to disable this.
-->
<burst-on-connect>1</burst-on-connect>
- <!-- same as burst-on-connect, but this allows for being more
specific on how much to burst. Most people won't need to
change from the default 64k. Applies to all mountpoints
-->
<burst-size>65535</burst-size>
</limits>
- <authentication>
- <!-- Sources log in with username 'source'
-->
<source-password>********</source-password>
- <!-- Relays log in username 'relay'
-->
<relay-password>********</relay-password>
- <!-- Admin logs in with the username given below
-->
<admin-user>*****</admin-user>
<admin-password>********</admin-password>
</authentication>
- <!-- Uncomment this if you want directory listings
-->
- <!-- <directory>
<yp-url-timeout>15</yp-url-timeout>
<yp-url>http://dir.xiph.org/cgi-bin/yp-cgi</yp-url>
</directory>
<directory>
<yp-url-timeout>15</yp-url-timeout>
<yp-url>http://www.oddsock.org/cgi-bin/yp-cgi</yp-url>
</directory>

-->
- <!-- This is the hostname other people will use to connect to your server.
It affects mainly the urls generated by Icecast for playlists and yp
listings.
-->
<hostname>MON IP</hostname>
- <!-- You can use these two if you only want a single listener
-->
- <!-- <port>****</port>
-->
- <!-- <bind-address>MON IP</bind-address>
-->
- <!-- You may have multiple <listener> elements
-->
- <listen-socket>
<port>****</port>
- <!-- <bind-address>MON IP</bind-address>
-->
</listen-socket>
- <!-- <listen-socket>
<port>****</port>
</listen-socket>

-->
- <!-- <master-server>MON IP</master-server>
-->
- <!-- <master-server-port>****</master-server-port>
-->
- <!-- <master-update-interval>120</master-update-interval>
-->
- <!-- <master-password>********</master-password>
-->
- <!-- setting this makes all relays on-demand unless overridden, this is
useful for master relays which do not have <relay> definitions here.
The default is 0
-->
- <!-- <relays-on-demand>1</relays-on-demand>
-->
- <!-- <relay>
<server>MON IP</server>
<port>****</port>
<mount>/example.ogg</mount>
<local-mount>/different.ogg</local-mount>
<on-demand>0</on-demand>

<relay-shoutcast-metadata>0</relay-shoutcast-metadata>
</relay>

-->
- <!-- Only define a <mount> section if you want to use advanced options,
like alternative usernames or passwords
<mount>
<mount-name>/example-complex.ogg</mount-name>

<username>othersource</username>
<password>hackmemore</password>

<max-listeners>1000</max-listeners>
<dump-file>/tmp/dump-example1.ogg</dump-file>
<burst-size>65536</burst-size>
<fallback-mount>/example2.ogg</fallback-mount>
<fallback-override>1</fallback-override>
<fallback-when-full>1</fallback-when-full>
<intro>/example_intro.ogg</intro>
<hidden>1</hidden>
<no-yp>1</no-yp>
<authentication type="htpasswd">
<option name="filename" value="myauth"/>
<option name="allow_duplicate_users" value="0"/>
</authentication>
<on-connect>/home/icecast/bin/stream-start</on-connect>
<on-disconnect>/home/icecast/bin/stream-stop</on-disconnect>
</mount>

<mount>
<mount-name>/auth_example.ogg</mount-name>
<authentication type="url">
<option name="mount_add" value="http://myauthserver.net/notify_mount.php"/>
<option name="mount_remove" value="http://myauthserver.net/notify_mount.php"/>
<option name="listener_add" value="http://myauthserver.net/notify_listener.php"/>
<option name="listener_remove" value="http://myauthserver.net/notify_listener.php"/>
</authentication>
</mount>


-->
<fileserve>1</fileserve>
- <!-- set the mountpoint for a shoutcast source to use, the default if not
specified is /stream but you can change it here if an alternative is
wanted or an extension is required
<shoutcast-mount>/live.nsv</shoutcast-mount>

-->
- <paths>
- <!-- basedir is only used if chroot is enabled
-->
<basedir>./</basedir>
- <!-- Note that if <chroot> is turned on below, these paths must both
be relative to the new root, not the original root
-->
<logdir>./logs</logdir>
<webroot>./web</webroot>
<adminroot>./admin</adminroot>
- <!-- <pidfile>./icecast.pid</pidfile>
-->
- <!-- Aliases: treat requests for 'source' path as being for 'dest' path
May be made specific to a port or bound address using the "port"
and "bind-address" attributes.

-->
- <!-- <alias source="/foo" dest="/bar"/>

-->
- <!-- Aliases: can also be used for simple redirections as well,
this example will redirect all requests for http://server:port/ to
the status page

-->
<alias source="/" dest="/status.xsl" />
</paths>
- <logging>
<accesslog>access.log</accesslog>
<errorlog>error.log</errorlog>
- <!-- <playlistlog>playlist.log</playlistlog>
-->
<loglevel>4</loglevel>
- <!-- 4 Debug, 3 Info, 2 Warn, 1 Error
-->
</logging>
- <security>
<chroot>0</chroot>
- <!-- <changeowner>
<user>nobody</user>
<group>nogroup</group>
</changeowner>

-->
</security>
</icecast>

J'espère qu'un pro de Icecast passera par là !
Merci pour vos réponses ;)