diff --git a/installer/prereq.sh b/installer/prereq.sh
index 34f309b..9c0606b 100755
--- a/installer/prereq.sh
+++ b/installer/prereq.sh
@@ -63,6 +63,12 @@ if [[ -z "$(lsmod | grep br_netfilter)" ]]; then
     echo "br_netfilter" >/etc/modules-load.d/br_netfilter.conf
 fi
 
+# Install ufw
+if ! command -v ufw &>/dev/null; then
+    stage "Installing ufw"
+    apt-get install -y ufw
+fi
+
 # -------------------------------
 # fstab changes
 # We do not edit original file, instead we create a temp file with original and edit it.
diff --git a/installer/sashimono-uninstall.sh b/installer/sashimono-uninstall.sh
index 4aa238a..9f49a10 100755
--- a/installer/sashimono-uninstall.sh
+++ b/installer/sashimono-uninstall.sh
@@ -17,8 +17,8 @@ function confirm() {
         read -p "'y' or 'n' expected: " yn </dev/tty
     done
 
-    echo "" # Insert new line after answering.
-    [[ $yn =~ ^[Yy]$ ]] && return 0 || return 1  # 0 means success.
+    echo ""                                     # Insert new line after answering.
+    [[ $yn =~ ^[Yy]$ ]] && return 0 || return 1 # 0 means success.
 }
 
 function cgrulesengd_servicename() {
@@ -87,10 +87,25 @@ if [ "$UPGRADE" == "0" ]; then
 
         echo "Deleting $ucount contract instances..."
         for user in "${sashiusers[@]}"; do
-            output=$($SASHIMONO_BIN/user-uninstall.sh $user | tee /dev/stderr)
+            homedir=$(eval echo ~$user)
+            cfgpath=$(find $homedir/ -type f -regex ^$homedir/[^/]+/cfg/hp.cfg$ 2>/dev/null | head -n 1)
+            instancename=$(echo $cfgpath | rev | cut -d '/' -f 3 | rev)
+            peerport=$(jq .mesh.port $cfgpath)
+            userport=$(jq .user.port $cfgpath)
+            output=$($SASHIMONO_BIN/user-uninstall.sh $user $peerport $userport $instancename | tee /dev/stderr)
             [ "${output: -10}" != "UNINST_SUC" ] && echo "Uninstall user '$user' failed. Aborting." && exit 1
         done
     fi
+
+    # Find if there are any garbage rules that are created by sashimono and remove them.
+    prefix="sashi"
+    ufw status | grep -E ^[0-9]+,[0-9]+/tcp\\s+ALLOW\\s+Anywhere\\s+\#\\s$prefix-.+$ | while read -r line; do
+        ports=$(echo $line | cut -d ' ' -f 1)
+        echo "Removing found garbage ufw $ports rule..."
+        p1=$(echo $ports | cut -d ',' -f 1)
+        p2=$(echo $ports | cut -d ',' -f 2 | cut -d '/' -f 1)
+        ufw delete allow "$p1","$p2"/tcp
+    done
 fi
 
 echo "Removing Sashimono cgroup creation service..."
@@ -157,9 +172,9 @@ if grep -q "^$MB_XRPL_USER:" /etc/passwd; then
     fi
 
     echo "Deleting message board user..."
-    # Killall command is not found in every linux systems, therefore pkill command is used. 
+    # Killall command is not found in every linux systems, therefore pkill command is used.
     # A small timeout(0.5 second) is applied before deleting the user because it takes some time to kill all the processes
-    loginctl disable-linger  $MB_XRPL_USER
+    loginctl disable-linger $MB_XRPL_USER
     pkill -u $MB_XRPL_USER # Kill any running processes.
     sleep 0.5
     userdel -f "$MB_XRPL_USER"