new file mode 100644
--- /dev/null
+++ b/stream_udp_limit_conn.t
@@ -0,0 +1,128 @@
+#!/usr/bin/perl
+
+# (C) Andrey Zelenkov
+# (C) Nginx, Inc.
+
+# Tests for stream limit_conn module with datagrams.
+
+###############################################################################
+
+use warnings;
+use strict;
+
+use Test::More;
+
+BEGIN { use FindBin; chdir($FindBin::Bin); }
+
+use lib 'lib';
+use Test::Nginx;
+use Test::Nginx::Stream qw/ dgram /;
+
+###############################################################################
+
+select STDERR; $| = 1;
+select STDOUT; $| = 1;
+
+my $t = Test::Nginx->new()->has(qw/stream stream_limit_conn shmem/)
+	->write_file_expand('nginx.conf', <<'EOF');
+
+%%TEST_GLOBALS%%
+
+daemon off;
+
+events {
+}
+
+stream {
+    limit_conn_zone  $binary_remote_addr  zone=zone:1m;
+    limit_conn_zone  $binary_remote_addr  zone=zone2:1m;
+
+    proxy_responses  1;
+    proxy_timeout    1s;
+
+    server {
+        listen           127.0.0.1:8081 udp;
+        proxy_pass       127.0.0.1:8080;
+
+        limit_conn       zone 1;
+        proxy_responses  2;
+    }
+
+    server {
+        listen           127.0.0.1:8082 udp;
+        proxy_pass       127.0.0.1:8080;
+        limit_conn       zone2 1;
+    }
+
+    server {
+        listen           127.0.0.1:8083 udp;
+        proxy_pass       127.0.0.1:8080;
+        limit_conn       zone 5;
+    }
+
+    server {
+        listen           127.0.0.1:8084 udp;
+        proxy_pass       127.0.0.1:8081;
+        limit_conn       zone2 1;
+    }
+
+    server {
+        listen           127.0.0.1:8085 udp;
+        proxy_pass       127.0.0.1:8081;
+        limit_conn       zone 1;
+    }
+}
+
+EOF
+
+$t->try_run('no stream udp')->plan(8);
+$t->run_daemon(\&udp_daemon, $t);
+$t->waitforfile($t->testdir . '/8080');
+
+###############################################################################
+
+my $str = '.';
+
+# same and other zones
+
+my $s = dgram('127.0.0.1:8081');
+
+is($s->io('1'), '1', 'passed');
+
+is(dgram('127.0.0.1:8081')->io('1'), '', 'rejected same zone');
+is(dgram('127.0.0.1:8082')->io('1'), '1', 'passed different zone');
+is(dgram('127.0.0.1:8083')->io('1'), '1', 'passed same zone unlimited');
+
+is($s->io('2', read => 2), '12', 'long connection');
+
+is(dgram('127.0.0.1:8081')->io('2', read => 2), '12', 'passed 2');
+
+# zones proxy chain
+
+is(dgram('127.0.0.1:8084')->io('1'), '1', 'passed proxy');
+is(dgram('127.0.0.1:8085')->io('1'), '', 'rejected proxy');
+
+###############################################################################
+
+sub udp_daemon {
+	my $t = shift;
+
+	my $server = IO::Socket::INET->new(
+		Proto => 'udp',
+		LocalAddr => '127.0.0.1:8080',
+		Reuse => 1,
+	)
+		or die "Can't create listening socket: $!\n";
+
+	# signal we are ready
+
+	open my $fh, '>', $t->testdir() . '/8080';
+	close $fh;
+
+	while (1) {
+		$server->recv(my $buffer, 65536);
+		$server->send($_) for (1 .. $buffer);
+	}
+}
+
+###############################################################################