diff --git a/out/locale/en/LC_MESSAGES/default.po b/out/locale/en/LC_MESSAGES/default.po
index a966bea0..7f41f88e 100644
--- a/out/locale/en/LC_MESSAGES/default.po
+++ b/out/locale/en/LC_MESSAGES/default.po
@@ -7,7 +7,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: HeidiSQL\n"
 "POT-Creation-Date: 2012-11-05 21:40\n"
-"PO-Revision-Date: 2015-04-26 15:27+0100\n"
+"PO-Revision-Date: 2015-05-11 19:49+0100\n"
 "Last-Translator: Ansgar Becker <anse@heidisql.com>\n"
 "Language-Team: English (http://www.transifex.com/projects/p/heidisql/"
 "language/en/)\n"
@@ -3962,6 +3962,10 @@ msgstr "PLink exited unexpected. Command line was: %s"
 msgid "Could not execute PLink: %s"
 msgstr "Could not execute PLink: %s"
 
+#. Plink connection
+msgid "Could not execute PLink: Port %d already in use."
+msgstr "Could not execute PLink: Port %d already in use."
+
 msgid ""
 "Connection closed immediately after it was established. This is mostly "
 "caused by an \"%s\" server variable which has errors in itself, or your user "
diff --git a/source/dbconnection.pas b/source/dbconnection.pas
index f0170357..09650c2d 100644
--- a/source/dbconnection.pas
+++ b/source/dbconnection.pas
@@ -818,6 +818,10 @@ var
   ExitCode: LongWord;
   Waited, ReturnedSomethingAt: Integer;
 begin
+  // Check if local port is open
+  if not PortOpen(FConnection.Parameters.SSHLocalPort) then
+    raise EDatabaseError.CreateFmt(_('Could not execute PLink: Port %d already in use.'), [FConnection.Parameters.SSHLocalPort]);
+
   // Build plink.exe command line
   // plink bob@domain.com -pw myPassw0rd1 -P 22 -i "keyfile.pem" -L 55555:localhost:3306
   PlinkParameters := '-ssh ';
diff --git a/source/helpers.pas b/source/helpers.pas
index 46e35698..5e2dbd72 100644
--- a/source/helpers.pas
+++ b/source/helpers.pas
@@ -13,7 +13,7 @@ uses
   Windows, ShlObj, ActiveX, VirtualTrees, SynRegExpr, Messages, Math,
   Registry, DateUtils, Generics.Collections, StrUtils, AnsiStrings, TlHelp32, Types,
   dbconnection, mysql_structures, SynMemo, Menus, WinInet, gnugettext, Themes,
-  Character, ImgList, System.UITypes, ActnList;
+  Character, ImgList, System.UITypes, ActnList, WinSock;
 
 type
 
@@ -325,6 +325,7 @@ type
   function GetSystemImageIndex(Filename: String): Integer;
   function GetExecutableBits: Byte;
   procedure Help(Sender: TObject; Anchor: String);
+  function PortOpen(Port: Word): Boolean;
 
 
 var
@@ -2690,6 +2691,29 @@ begin
 end;
 
 
+function PortOpen(Port: Word): Boolean;
+var
+  client: sockaddr_in;
+  sock: Integer;
+  ret: Integer;
+  wsdata: WSAData;
+begin
+  Result := True;
+  ret := WSAStartup($0002, wsdata);
+  if ret<>0 then
+    Exit;
+  try
+    client.sin_family := AF_INET;
+    client.sin_port := htons(Port);
+    client.sin_addr.s_addr := inet_addr(PAnsiChar('127.0.0.1'));
+    sock := socket(AF_INET, SOCK_STREAM, 0);
+    Result := connect(sock, client, SizeOf(client)) <> 0;
+  finally
+    WSACleanup;
+  end;
+end;
+
+
 
 
 { Threading stuff }