diff --git a/phpseclib/Net/SSH2.php b/phpseclib/Net/SSH2.php
index 85cd9439..4b2bb8d1 100644
--- a/phpseclib/Net/SSH2.php
+++ b/phpseclib/Net/SSH2.php
@@ -869,7 +869,9 @@ class SSH2
     /**
      * Default Constructor.
      *
-     * @param String $host
+     * $host can either be a string, representing the host, or a stream resource.
+     *
+     * @param Mixed $host
      * @param optional Integer $port
      * @param optional Integer $timeout
      * @see \phpseclib\Net\SSH2::login()
@@ -954,9 +956,16 @@ class SSH2
                   34 => 'NET_SSH2_MSG_KEXDH_GEX_REQUEST')
         );
 
-        $this->host = $host;
-        $this->port = $port;
-        $this->timeout = $timeout;
+        if (is_resource($host)) {
+            $this->fsock = $host;
+            return;
+        }
+
+        if (is_string($host)) {
+            $this->host = $host;
+            $this->port = $port;
+            $this->timeout = $timeout;
+        }
     }
 
     /**
@@ -993,19 +1002,21 @@ class SSH2
 
         $this->last_packet = microtime(true);
 
-        $start = microtime(true);
-        $this->fsock = @fsockopen($this->host, $this->port, $errno, $errstr, $this->curTimeout);
-        if (!$this->fsock) {
-            user_error(rtrim("Cannot connect to $host. Error $errno. $errstr"));
-            return false;
-        }
-        $elapsed = microtime(true) - $start;
+        if (!is_resource($this->fsock)) {
+            $start = microtime(true);
+            $this->fsock = @fsockopen($this->host, $this->port, $errno, $errstr, $this->curTimeout);
+            if (!$this->fsock) {
+                user_error(rtrim("Cannot connect to $host. Error $errno. $errstr"));
+                return false;
+            }
+            $elapsed = microtime(true) - $start;
 
-        $this->curTimeout-= $elapsed;
+            $this->curTimeout-= $elapsed;
 
-        if ($this->curTimeout <= 0) {
-            $this->is_timeout = true;
-            return false;
+            if ($this->curTimeout <= 0) {
+                $this->is_timeout = true;
+                return false;
+            }
         }
 
         /* According to the SSH2 specs,
diff --git a/tests/Functional/Net/SSH2Test.php b/tests/Functional/Net/SSH2Test.php
index 44f18d1e..51373705 100644
--- a/tests/Functional/Net/SSH2Test.php
+++ b/tests/Functional/Net/SSH2Test.php
@@ -87,4 +87,17 @@ class Functional_Net_SSH2Test extends PhpseclibFunctionalTestCase
 
         $this->assertInternalType('string', $ssh->getServerPublicHostKey());
     }
+
+    public function testOpenSocketConnect()
+    {
+        $fsock = fsockopen($this->getEnv('SSH_HOSTNAME'), 22);
+        $ssh = new SSH2($fsock);
+
+        $username = $this->getEnv('SSH_USERNAME');
+        $password = $this->getEnv('SSH_PASSWORD');
+        $this->assertTrue(
+            $ssh->login($username, $password),
+            'SSH2 login using an open socket failed.'
+        );
+    }
 }