diff --git a/extras/ikev2changeaddr.sh b/extras/ikev2changeaddr.sh
index bd0e353..0f49d01 100755
--- a/extras/ikev2changeaddr.sh
+++ b/extras/ikev2changeaddr.sh
@@ -90,7 +90,7 @@ EOF
 check_libreswan() {
   ipsec_ver=$(ipsec --version 2>/dev/null)
   if ( ! grep -qs "hwdsl2 VPN script" /etc/sysctl.conf && ! grep -qs "hwdsl2" /opt/src/run.sh ) \
-    || ! printf '%s' "$ipsec_ver" | grep -q "Libreswan"; then
+    || ! printf '%s' "$ipsec_ver" | grep -qi 'libreswan'; then
 cat 1>&2 <<'EOF'
 Error: This script can only be used with an IPsec server created using:
        https://github.com/hwdsl2/setup-ipsec-vpn
diff --git a/extras/ikev2onlymode.sh b/extras/ikev2onlymode.sh
index 532938c..e537b43 100755
--- a/extras/ikev2onlymode.sh
+++ b/extras/ikev2onlymode.sh
@@ -49,7 +49,7 @@ check_libreswan() {
   swan_ver=$(printf '%s' "$ipsec_ver" | sed -e 's/.*Libreswan U\?//' -e 's/\( (\|\/K\).*//')
   if ! grep -qs "hwdsl2 VPN script" /etc/sysctl.conf \
     || ! grep -qs "config setup" /etc/ipsec.conf \
-    || ! printf '%s' "$ipsec_ver" | grep -q "Libreswan"; then
+    || ! printf '%s' "$ipsec_ver" | grep -qi 'libreswan'; then
 cat 1>&2 <<'EOF'
 Error: Your must first set up the IPsec VPN server before selecting IKEv2-only mode.
        See: https://github.com/hwdsl2/setup-ipsec-vpn
diff --git a/extras/ikev2setup.sh b/extras/ikev2setup.sh
index a2ca305..2901c9b 100755
--- a/extras/ikev2setup.sh
+++ b/extras/ikev2setup.sh
@@ -101,7 +101,7 @@ EOF
 check_libreswan() {
   ipsec_ver=$(ipsec --version 2>/dev/null)
   if ( ! grep -qs "hwdsl2 VPN script" /etc/sysctl.conf && ! grep -qs "hwdsl2" /opt/src/run.sh ) \
-    || ! printf '%s' "$ipsec_ver" | grep -q "Libreswan"; then
+    || ! printf '%s' "$ipsec_ver" | grep -qi 'libreswan'; then
 cat 1>&2 <<'EOF'
 Error: Your must first set up the IPsec VPN server before setting up IKEv2.
        See: https://github.com/hwdsl2/setup-ipsec-vpn
diff --git a/extras/vpnuninstall.sh b/extras/vpnuninstall.sh
index ebf847e..5b59f1d 100755
--- a/extras/vpnuninstall.sh
+++ b/extras/vpnuninstall.sh
@@ -71,7 +71,7 @@ EOF
 check_libreswan() {
   ipsec_ver=$(ipsec --version 2>/dev/null)
   if ! grep -qs "hwdsl2 VPN script" /etc/sysctl.conf \
-    || ! printf '%s' "$ipsec_ver" | grep -q "Libreswan"; then
+    || ! printf '%s' "$ipsec_ver" | grep -qi 'libreswan'; then
     exiterr "Cannot remove IPsec VPN because it has not been set up on this server."
   fi
 }
diff --git a/extras/vpnupgrade.sh b/extras/vpnupgrade.sh
index 74e17fe..7c09588 100755
--- a/extras/vpnupgrade.sh
+++ b/extras/vpnupgrade.sh
@@ -93,7 +93,7 @@ EOF
 
 check_libreswan() {
   ipsec_ver=$(/usr/local/sbin/ipsec --version 2>/dev/null)
-  if ! printf '%s' "$ipsec_ver" | grep -q "Libreswan"; then
+  if ! printf '%s' "$ipsec_ver" | grep -qi 'libreswan'; then
 cat 1>&2 <<'EOF'
 Error: This script requires Libreswan already installed.
        See: https://github.com/hwdsl2/setup-ipsec-vpn
diff --git a/extras/vpnupgrade_alpine.sh b/extras/vpnupgrade_alpine.sh
index 136e1b1..71add4e 100755
--- a/extras/vpnupgrade_alpine.sh
+++ b/extras/vpnupgrade_alpine.sh
@@ -59,7 +59,7 @@ check_os() {
 check_libreswan() {
   ipsec_ver=$(/usr/local/sbin/ipsec --version 2>/dev/null)
   swan_ver_old=$(printf '%s' "$ipsec_ver" | sed -e 's/.*Libreswan U\?//' -e 's/\( (\|\/K\).*//')
-  if ! printf '%s' "$ipsec_ver" | grep -q "Libreswan"; then
+  if ! printf '%s' "$ipsec_ver" | grep -qi 'libreswan'; then
 cat 1>&2 <<'EOF'
 Error: This script requires Libreswan already installed.
        See: https://github.com/hwdsl2/setup-ipsec-vpn
diff --git a/extras/vpnupgrade_amzn.sh b/extras/vpnupgrade_amzn.sh
index 4c69995..69ee61c 100755
--- a/extras/vpnupgrade_amzn.sh
+++ b/extras/vpnupgrade_amzn.sh
@@ -42,7 +42,7 @@ check_os() {
 check_libreswan() {
   ipsec_ver=$(/usr/local/sbin/ipsec --version 2>/dev/null)
   swan_ver_old=$(printf '%s' "$ipsec_ver" | sed -e 's/.*Libreswan U\?//' -e 's/\( (\|\/K\).*//')
-  if ! printf '%s' "$ipsec_ver" | grep -q "Libreswan"; then
+  if ! printf '%s' "$ipsec_ver" | grep -qi 'libreswan'; then
 cat 1>&2 <<'EOF'
 Error: This script requires Libreswan already installed.
        See: https://github.com/hwdsl2/setup-ipsec-vpn
diff --git a/extras/vpnupgrade_centos.sh b/extras/vpnupgrade_centos.sh
index 851a48b..02e354f 100755
--- a/extras/vpnupgrade_centos.sh
+++ b/extras/vpnupgrade_centos.sh
@@ -60,7 +60,7 @@ check_os() {
 check_libreswan() {
   ipsec_ver=$(/usr/local/sbin/ipsec --version 2>/dev/null)
   swan_ver_old=$(printf '%s' "$ipsec_ver" | sed -e 's/.*Libreswan U\?//' -e 's/\( (\|\/K\).*//')
-  if ! printf '%s' "$ipsec_ver" | grep -q "Libreswan"; then
+  if ! printf '%s' "$ipsec_ver" | grep -qi 'libreswan'; then
 cat 1>&2 <<'EOF'
 Error: This script requires Libreswan already installed.
        See: https://github.com/hwdsl2/setup-ipsec-vpn
diff --git a/extras/vpnupgrade_ubuntu.sh b/extras/vpnupgrade_ubuntu.sh
index 78d2efb..f27d7a0 100755
--- a/extras/vpnupgrade_ubuntu.sh
+++ b/extras/vpnupgrade_ubuntu.sh
@@ -65,7 +65,7 @@ check_os() {
 check_libreswan() {
   ipsec_ver=$(/usr/local/sbin/ipsec --version 2>/dev/null)
   swan_ver_old=$(printf '%s' "$ipsec_ver" | sed -e 's/.*Libreswan U\?//' -e 's/\( (\|\/K\).*//')
-  if ! printf '%s' "$ipsec_ver" | grep -q "Libreswan"; then
+  if ! printf '%s' "$ipsec_ver" | grep -qi 'libreswan'; then
 cat 1>&2 <<'EOF'
 Error: This script requires Libreswan already installed.
        See: https://github.com/hwdsl2/setup-ipsec-vpn
diff --git a/vpnsetup_alpine.sh b/vpnsetup_alpine.sh
index 8b74ddf..26472d4 100755
--- a/vpnsetup_alpine.sh
+++ b/vpnsetup_alpine.sh
@@ -202,11 +202,14 @@ get_swan_ver() {
 }
 
 check_libreswan() {
+  ipsec_bin="/usr/local/sbin/ipsec"
   ipsec_ver=$(/usr/local/sbin/ipsec --version 2>/dev/null)
   swan_ver_old=$(printf '%s' "$ipsec_ver" | sed -e 's/.*Libreswan U\?//' -e 's/\( (\|\/K\).*//')
-  if [ -n "$swan_ver_old" ] && [ "$(find /usr/local/sbin/ipsec -mmin -10080)" ]; then
+  if [ -n "$swan_ver_old" ] && printf '%s' "$ipsec_ver" | grep -qi 'libreswan' \
+    && [ "$(find "$ipsec_bin" -mmin -10080)" ]; then
     return 0
   fi
+  [ -s "$ipsec_bin" ] && touch "$ipsec_bin"
   get_swan_ver
   [ "$swan_ver_old" = "$SWAN_VER" ]
 }
diff --git a/vpnsetup_amzn.sh b/vpnsetup_amzn.sh
index 102a4a4..8e5543b 100755
--- a/vpnsetup_amzn.sh
+++ b/vpnsetup_amzn.sh
@@ -202,11 +202,14 @@ get_swan_ver() {
 }
 
 check_libreswan() {
+  ipsec_bin="/usr/local/sbin/ipsec"
   ipsec_ver=$(/usr/local/sbin/ipsec --version 2>/dev/null)
   swan_ver_old=$(printf '%s' "$ipsec_ver" | sed -e 's/.*Libreswan U\?//' -e 's/\( (\|\/K\).*//')
-  if [ -n "$swan_ver_old" ] && [ "$(find /usr/local/sbin/ipsec -mmin -10080)" ]; then
+  if [ -n "$swan_ver_old" ] && printf '%s' "$ipsec_ver" | grep -qi 'libreswan' \
+    && [ "$(find "$ipsec_bin" -mmin -10080)" ]; then
     return 0
   fi
+  [ -s "$ipsec_bin" ] && touch "$ipsec_bin"
   get_swan_ver
   [ "$swan_ver_old" = "$SWAN_VER" ]
 }
diff --git a/vpnsetup_centos.sh b/vpnsetup_centos.sh
index 383d07b..4dc4ef9 100755
--- a/vpnsetup_centos.sh
+++ b/vpnsetup_centos.sh
@@ -259,11 +259,14 @@ get_swan_ver() {
 }
 
 check_libreswan() {
+  ipsec_bin="/usr/local/sbin/ipsec"
   ipsec_ver=$(/usr/local/sbin/ipsec --version 2>/dev/null)
   swan_ver_old=$(printf '%s' "$ipsec_ver" | sed -e 's/.*Libreswan U\?//' -e 's/\( (\|\/K\).*//')
-  if [ -n "$swan_ver_old" ] && [ "$(find /usr/local/sbin/ipsec -mmin -10080)" ]; then
+  if [ -n "$swan_ver_old" ] && printf '%s' "$ipsec_ver" | grep -qi 'libreswan' \
+    && [ "$(find "$ipsec_bin" -mmin -10080)" ]; then
     return 0
   fi
+  [ -s "$ipsec_bin" ] && touch "$ipsec_bin"
   get_swan_ver
   [ "$swan_ver_old" = "$SWAN_VER" ]
 }
diff --git a/vpnsetup_ubuntu.sh b/vpnsetup_ubuntu.sh
index 8fba9a7..0204572 100755
--- a/vpnsetup_ubuntu.sh
+++ b/vpnsetup_ubuntu.sh
@@ -242,11 +242,14 @@ get_swan_ver() {
 }
 
 check_libreswan() {
+  ipsec_bin="/usr/local/sbin/ipsec"
   ipsec_ver=$(/usr/local/sbin/ipsec --version 2>/dev/null)
   swan_ver_old=$(printf '%s' "$ipsec_ver" | sed -e 's/.*Libreswan U\?//' -e 's/\( (\|\/K\).*//')
-  if [ -n "$swan_ver_old" ] && [ "$(find /usr/local/sbin/ipsec -mmin -10080)" ]; then
+  if [ -n "$swan_ver_old" ] && printf '%s' "$ipsec_ver" | grep -qi 'libreswan' \
+    && [ "$(find "$ipsec_bin" -mmin -10080)" ]; then
     return 0
   fi
+  [ -s "$ipsec_bin" ] && touch "$ipsec_bin"
   get_swan_ver
   [ "$swan_ver_old" = "$SWAN_VER" ]
 }