diff --git a/extras/quickstart.sh b/extras/quickstart.sh
index bb3616e..0ae46c0 100755
--- a/extras/quickstart.sh
+++ b/extras/quickstart.sh
@@ -36,7 +36,7 @@ check_vz() {
 check_lxc() {
   # shellcheck disable=SC2154
   if [ "$container" = "lxc" ] && [ ! -e /dev/ppp ]; then
-cat >&2 <<'EOF'
+cat 1>&2 <<'EOF'
 Error: /dev/ppp is missing. LXC containers require configuration.
        See: https://github.com/hwdsl2/setup-ipsec-vpn/issues/1014
 EOF
diff --git a/vpnsetup.sh b/vpnsetup.sh
index 05acc66..df2e9a1 100755
--- a/vpnsetup.sh
+++ b/vpnsetup.sh
@@ -58,7 +58,7 @@ check_vz() {
 check_lxc() {
   # shellcheck disable=SC2154
   if [ "$container" = "lxc" ] && [ ! -e /dev/ppp ]; then
-cat >&2 <<'EOF'
+cat 1>&2 <<'EOF'
 Error: /dev/ppp is missing. LXC containers require configuration.
        See: https://github.com/hwdsl2/setup-ipsec-vpn/issues/1014
 EOF
diff --git a/vpnsetup_ubuntu.sh b/vpnsetup_ubuntu.sh
index de6ff29..6889d28 100755
--- a/vpnsetup_ubuntu.sh
+++ b/vpnsetup_ubuntu.sh
@@ -587,8 +587,8 @@ EOF
   if [ ! -e /dev/ppp ]; then
 cat <<'EOF'
 Warning: /dev/ppp is missing, and IPsec/L2TP mode may not work. Please use
-         IKEv2 (https://git.io/ikev2) or IPsec/XAuth ("Cisco IPsec") mode
-         to connect. Debian 11/10 users, see https://git.io/vpndebian10.
+         IKEv2 (https://git.io/ikev2) or IPsec/XAuth mode to connect.
+         Debian 11/10 users, see https://git.io/vpndebian10
 
 EOF
   fi