Sur le serveur, d'ailleur voici le résultat du service plexmediaserver status
● plexmediaserver.service - Plex Media Server for Linux
Loaded: loaded (/etc/systemd/system/plexmediaserver.service; enabled)
Active: failed (Result: start-limit) since jeu. 2017-02-09 20:54:47 CET; 3h 21min ago
Process: 5715 ExecStart=/bin/sh -c LD_LIBRARY_PATH=/usr/lib/plexmediaserver /usr/lib/plexmediaserver/Plex\ Media\ Server (code=exited, status=255)
Process: 5710 ExecStartPre=/bin/sh -c /usr/bin/test -d "${PLEX_MEDIA_SERVER_APPLICATION_SUPPORT_DIR}" || /bin/mkdir -p "${PLEX_MEDIA_SERVER_APPLICATION_SUPPORT_DIR}" (code=exited, status=0/SUCCESS)
Main PID: 5715 (code=exited, status=255)
févr. 09 20:54:42 serveur systemd[1]: Unit plexmediaserver.service entered failed state.
févr. 09 20:54:47 serveur systemd[1]: plexmediaserver.service holdoff time over, scheduling restart.
févr. 09 20:54:47 serveur systemd[1]: Stopping Plex Media Server for Linux...
févr. 09 20:54:47 serveur systemd[1]: Starting Plex Media Server for Linux...
févr. 09 20:54:47 serveur systemd[1]: plexmediaserver.service start request repeated too quickly, refusing to start.
févr. 09 20:54:47 serveur systemd[1]: Failed to start Plex Media Server for Linux.
févr. 09 20:54:47 serveur systemd[1]: Unit plexmediaserver.service entered failed state.