diff --git a/Dockerfile b/Dockerfile
index b55acbc..b7c02a8 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,6 @@
-FROM debian 
+FROM debian:10
 
-RUN apt-get update && apt-get install -y minidlna vim net-tools
+RUN apt-get update && apt-get install -y minidlna minissdpd net-tools
 
 COPY files/start.sh /opt/start.sh
 RUN chmod 755 /opt/start.sh
diff --git a/README.md b/README.md
index ffb5aca..b680d0d 100644
--- a/README.md
+++ b/README.md
@@ -12,12 +12,18 @@ docker build -t croc/minidlna .
 ## Run
 
 ```
-docker run -tid --name=minidlna --net=host -e SRVNAME=dockerlna -e "FOLDERS=/mnt/data/mp3,/mnt/data/movie,/mnt/data/torrent" -v /mnt/data/pub/:/mnt/data croc/minidlna /opt/start.sh
+docker run -tid --name=minidlna --net=host -e SRVNAME=dockerlna -e "FOLDERS=/mnt/data/mp3,/mnt/data/movie,/mnt/data/torrent" -v /mnt/data/pub/:/mnt/data croc/minidlna
 ```
 
-  - `SRVNAME` - name of the minidlna
-  - `FOLDERS` - list of the shared folders in your volume (/mnt/data)
+  - `SRVNAME` - name of the minidlna server
+  - `FOLDERS` - list of the shared folders on your volume (/mnt/data)
 
 Please use docker-compose file (from my Github page) for easier management. 
 
 
+## Known errors
+
+Container always restarts and `SSDP service start problem` message in the container logs.
+Check the 1900 UDP port on your docker host (example: `ss -lntpu | grep -i 1900` ) maybe already in use.
+Stop another UPNP service, like Jellyfin/Plex/Emby server to free up this port and try again.
+
diff --git a/docker-compose.yml b/docker-compose.yml
index c2a4c89..5c10843 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -6,6 +6,8 @@ services:
     environment:
       - SRVNAME=docker-minidlna
       - PORT=8205
+      # specify an UPNP interface if you have multiple network interface
+      #- SSDP_IFACE=eth0
       - FOLDERS=/media/mp3,/media/movies,/media/tv_series
     volumes:
       - '/mnt/data/pub/movies:/media/movies'
diff --git a/files/start.sh b/files/start.sh
index 760218c..cc716ea 100644
--- a/files/start.sh
+++ b/files/start.sh
@@ -2,24 +2,46 @@
 
 if [ ! -e /etc/minidlna.configured ]
 then
+  # set friendly name
+  sed -i "s@.*friendly_name=.*@friendly_name=$SRVNAME@g" /etc/minidlna.conf
+  # set port
+  [ -z $PORT ] && { PORT=8201; }
+  sed -i "s@port=.*00@port=$PORT@g" /etc/minidlna.conf
+
+  # remove media folders
   sed -i s@media_dir=@\#media_dir=@g /etc/minidlna.conf
-
-  echo "friendly_name=$SRVNAME" >> /etc/minidlna.conf
-
+  # add media folders to the end of file
   for folder in $( echo $FOLDERS | xargs -d',' )
   do
     echo "media_dir=$folder" >> /etc/minidlna.conf
   done
 
-  [ -z $PORT ] && { PORT=8201; }
-  sed -i "s@port=.*00@port=$PORT@g" /etc/minidlna.conf 
-
   date > /etc/minidlna.configured
 fi
 
+# minissdp
+#  get interfaces
+if [ -z "$SSDP_IFACE" ]
+then
+  SSDP_INTERFACE="$( ip addr | grep -i up | egrep -iv '(lo|br-|veth|docker).*:' | cut -f2 -d':' | tr -d ' ' )"
+  if [ $( echo "$INTERFACE" | wc -l ) -gt 1 ]
+  then
+    echo -e "You have more than one interface, choose one!:\n$SSDP_INTERFACE"
+    exit 1
+  fi
+  SSDP_IFACE=$SSDP_INTERFACE
+fi
+if [ $( ss -lntpu | grep -i 1900 | wc -l ) -gt 0 ]
+then
+  echo "Warning, another UPNP service use same UDP port!"
+  echo " Please stop another server and try again."
+fi
+minissdpd -i $SSDP_IFACE || { echo "SSDP service start problem"; exit 1; }
+
+
 # remove stucked pid file
 rm -f /run/minidlna/minidlna.pid
 # start minidlna
-minidlnad -d
+minidlnad -d -v
 
 #/bin/bash