diff --git a/ext/ftp/tests/server.inc b/ext/ftp/tests/server.inc
index 5629c2e312291..1a04cd179bedd 100644
--- a/ext/ftp/tests/server.inc
+++ b/ext/ftp/tests/server.inc
@@ -139,7 +139,10 @@ if ($pid) {
 			$buf = fread($s, 2048);
 		}
 
-		if (!preg_match('/^USER (\w+)\r\n$/', $buf, $m)) {
+		if ($buf == "AUTH TLS\r\n") {
+		   fputs($s, "500 not supported.\r\n");
+		   return ;
+		} else if (!preg_match('/^USER (\w+)\r\n$/', $buf, $m)) {
 			fputs($s, "500 Syntax error, command unrecognized.\r\n");
 			dump_and_exit($buf);
 		}
@@ -208,6 +211,10 @@ if ($pid) {
 			$ascii = true;
 			fputs($s, "200 OK\r\n");
 
+		} elseif ($buf === "AUTH SSL\r\n") {
+			$ascii = true;
+			fputs($s, "500 not supported\r\n");
+
 		} elseif ($buf === "TYPE I\r\n") {
 			$ascii = false;
 			fputs($s, "200 OK\r\n");
diff --git a/ext/standard/tests/streams/bug72771.phpt b/ext/standard/tests/streams/bug72771.phpt
new file mode 100644
index 0000000000000..b38ccbdda8260
--- /dev/null
+++ b/ext/standard/tests/streams/bug72771.phpt
@@ -0,0 +1,23 @@
+--TEST--
+Bug #72771. FTPS to FTP downgrade not allowed when server doesn't support AUTH TLS or AUTH SSL.
+--SKIPIF--
+<?php
+if (array_search('ftp',stream_get_wrappers()) === FALSE) die("skip ftp wrapper not available.");
+if (!function_exists('pcntl_fork')) die("skip pcntl_fork() not available.");
+if (!extension_loaded('openssl')) die ("skip openssl not available.");
+?>
+--FILE--
+<?php
+
+require __DIR__ . "/../../../ftp/tests/server.inc";
+
+$path="ftps://127.0.0.1:" . $port."/";
+
+$ds=opendir($path, $context);
+var_dump($ds);
+?>
+==DONE== 
+--EXPECTF--
+Warning: opendir(ftps://127.0.0.1:%d/): failed to open dir: Server doesn't support FTPS. in %s on line %d
+bool(false)
+==DONE==