diff --git a/live_exam_os/Dockerfile b/live_exam_os/Dockerfile
index 72aaa8f8d165dbc10ed360253ecb9c59b8d196cd..620dfeae91c7453b3973de30d4ecb82f41c486ea 100644
--- a/live_exam_os/Dockerfile
+++ b/live_exam_os/Dockerfile
@@ -6,6 +6,7 @@ RUN apt-get update && apt-get install -y \
   && rm -rf /var/lib/apt/lists/*
 
 ARG server_ip
+ARG server_port
 ARG config_dir
 
 #ARG nexus_cert
@@ -52,6 +53,7 @@ ADD ${config_dir}/isolinux_stdmenu.cfg config/includes.binary/isolinux/stdmenu.c
 ADD ${config_dir}/live-exam-hook config/includes.chroot/lib/live/config/9999-custom
 # update server destination from docker's variable (all others IP are banned)
 RUN echo "firewall ${server_ip}\n" >> config/includes.chroot/lib/live/config/9999-custom
+RUN sed s,_SERVER_PORT_,${server_port},g config/includes.chroot/lib/live/config/9999-custom > config/includes.chroot/lib/live/config/9999-custom.new && mv config/includes.chroot/lib/live/config/9999-custom.new config/includes.chroot/lib/live/config/9999-custom
 
 # install wifi template
 ADD ${config_dir}/WIFI.nmconnection config/includes.chroot/etc/NetworkManager/system-connections/
diff --git a/live_exam_os/build_live_exam_iso b/live_exam_os/build_live_exam_iso
index 0d703d2f4c483a92daf0a5bd51d7c9f93d566b0f..844324f853e428ed05c5a1a08b3d4e5b99c305c2 100755
--- a/live_exam_os/build_live_exam_iso
+++ b/live_exam_os/build_live_exam_iso
@@ -18,7 +18,7 @@ usage () {
 }
 
 build_docker_image () {
-    if docker buildx build . -t "$DOCKER_IMG" --build-arg config_dir=$CONFIG_DIR --build-arg server_ip=$SERVER_IP ; then
+    if docker buildx build . -t "$DOCKER_IMG" --build-arg config_dir=$CONFIG_DIR --build-arg server_ip=$SERVER_IP --build-arg server_port=$SERVER_PORT ; then
         echo "Docker image \"$DOCKER_IMG\" sucessfully built"
     else
         echo "FAILED building docker image!" && abort
diff --git a/live_exam_os/config/live-exam-hook b/live_exam_os/config/live-exam-hook
index adfad835362ed6fadcb1d07f4bd7d7f15e91d049..acabcf699864c359a98acdc78347102be58e1222 100755
--- a/live_exam_os/config/live-exam-hook
+++ b/live_exam_os/config/live-exam-hook
@@ -22,19 +22,29 @@ add_nexus_certs ()
 
 disable_screen_blanking()
 {
-    echo "xset s off" > /etc/X11/Xsession.d/99xsetoff
+    echo "xset s off" >> /home/nexus/.xsession
+}
+
+max_screen_brightness()
+{
+    brightnessctl set 100%
 }
 
 firewall ()
 {
-ufw default deny incoming
+    ufw default deny incoming
     ufw default deny outgoing
     ufw allow in from any port 68 to any port 67 proto udp
-    # ufw allow from any to any port 22
+    ufw allow from any to any port 80
+    ufw allow from any to any port 443
+    ufw allow from any to any port _SERVER_PORT_
     ufw allow out from any to $1 port 1025:65535 proto tcp
     ufw allow out from any to $1 port 1025:65535 proto udp
+    # ufw allow from any to any port 22
     ufw enable
 }
 
 #add_nexus_certs
-disable_screen_blanking
+
+#max_screen_brightness
+#disable_screen_blanking
diff --git a/live_exam_os/config/packages.list.chroot b/live_exam_os/config/packages.list.chroot
index 00810d2c4f5b4895a4d79bd1d34f447a0f64b8a3..0350e41c0304873baa16408c52ea1cc5db19d326 100644
--- a/live_exam_os/config/packages.list.chroot
+++ b/live_exam_os/config/packages.list.chroot
@@ -11,3 +11,4 @@ virt-viewer
 firmware-iwlwifi
 network-manager
 network-manager-gnome
+brightnessctl