diff --git a/config/cfgroot/general-functions.pl b/config/cfgroot/general-functions.pl
index 4365de5de..78f925f70 100644
--- a/config/cfgroot/general-functions.pl
+++ b/config/cfgroot/general-functions.pl
@@ -203,6 +203,21 @@ sub validport
 	return 0;
 }
 
+sub validproxyport
+{
+	$_ = $_[0];
+
+	if (!/^\d+$/) {
+		return 0; }
+	if (/^0./) {
+		return 0; }
+	if ($_ == 53 || $_ == 222 || $_ == 444 || $_ == 81 ) {
+		return 0; }
+	elsif ($_ >= 1 && $_ <= 65535) {
+		return 1; }
+	return 0;
+}
+
 sub validmac
 {
 	my $checkmac = $_[0];
diff --git a/html/cgi-bin/proxy.cgi b/html/cgi-bin/proxy.cgi
index e582b4e57..b91ec3a90 100644
--- a/html/cgi-bin/proxy.cgi
+++ b/html/cgi-bin/proxy.cgi
@@ -312,7 +312,7 @@ if (($proxysettings{'ACTION'} eq $Lang::tr{'save'}) || ($proxysettings{'ACTION'}
 		$errormessage = $Lang::tr{'invalid input'};
 		goto ERROR;
 	} 
-	if (!(&General::validport($proxysettings{'PROXY_PORT'})))
+	if (!(&General::validproxyport($proxysettings{'PROXY_PORT'})))
 	{
 		$errormessage = $Lang::tr{'advproxy errmsg invalid proxy port'};
 		goto ERROR;