diff --git a/Duplicati/GUI/Duplicati.GUI.TrayIcon/Program.cs b/Duplicati/GUI/Duplicati.GUI.TrayIcon/Program.cs
index 7fd459f44..67a23b33d 100644
--- a/Duplicati/GUI/Duplicati.GUI.TrayIcon/Program.cs
+++ b/Duplicati/GUI/Duplicati.GUI.TrayIcon/Program.cs
@@ -82,9 +82,21 @@ namespace Duplicati.GUI.TrayIcon
                 else
                     toolkit = DEFAULT_TOOLKIT;
             }
-            
-            
-            using (var hosted = Library.Utility.Utility.ParseBoolOption(options, NOHOSTEDSERVER_OPTION) ? null : new HostedInstanceKeeper(_args))
+
+            HostedInstanceKeeper hosted = null;
+            if (!Library.Utility.Utility.ParseBoolOption(options, NOHOSTEDSERVER_OPTION))
+            {
+                try
+                {
+                    hosted = new HostedInstanceKeeper(_args);
+                }
+                catch (Server.SingleInstance.MultipleInstanceException)
+                {
+                    return;
+                }
+            }
+
+            using (hosted)
             {
                 string url;
                 if (!options.TryGetValue(HOSTURL_OPTION, out url))
@@ -104,6 +116,8 @@ namespace Duplicati.GUI.TrayIcon
                 {
                     using(var tk = RunTrayIcon(toolkit))
                     {
+                        if (hosted != null && Server.Program.Instance != null)
+                            Server.Program.Instance.SecondInstanceDetected += new Server.SingleInstance.SecondInstanceDelegate(x => { tk.ShowUrlInWindow(url); });
                         tk.Init(_args);
                     }
                 }
diff --git a/Duplicati/Server/Program.cs b/Duplicati/Server/Program.cs
index 28867a583..b77976400 100644
--- a/Duplicati/Server/Program.cs
+++ b/Duplicati/Server/Program.cs
@@ -32,6 +32,11 @@ namespace Duplicati.Server
         /// </summary>
         public static string DATAFOLDER { get { return Library.Utility.Utility.AppendDirSeparator(Environment.ExpandEnvironmentVariables("%" + DATAFOLDER_ENV_NAME + "%").TrimStart('"').TrimEnd('"')); } }
 
+        /// <summary>
+        /// The single instance
+        /// </summary>
+        public static SingleInstance Instance = null;
+
         /// <summary>
         /// A flag indicating if database encryption is in use
         /// </summary>
@@ -199,13 +204,6 @@ namespace Duplicati.Server
                 foreach (string s in Enum.GetNames(typeof(Duplicati.Library.Logging.LogMessageType)))
                     if (s.Equals(commandlineOptions["log-level"].Trim(), StringComparison.InvariantCultureIgnoreCase))
                         Duplicati.Library.Logging.Log.LogLevel = (Duplicati.Library.Logging.LogMessageType)Enum.Parse(typeof(Duplicati.Library.Logging.LogMessageType), s);
-
-            if (commandlineOptions.ContainsKey("log-file"))
-            {
-                if (System.IO.File.Exists(commandlineOptions["log-file"]))
-                    System.IO.File.Delete(commandlineOptions["log-file"]);
-                Duplicati.Library.Logging.Log.CurrentLog = new Duplicati.Library.Logging.StreamLog(commandlineOptions["log-file"]);
-            }
             
             //Set the %DUPLICATI_HOME% env variable, if it is not already set
             if (string.IsNullOrEmpty(Environment.GetEnvironmentVariable(DATAFOLDER_ENV_NAME)))
@@ -229,14 +227,12 @@ namespace Duplicati.Server
 #endif
             }
 
-            SingleInstance instance = null;
-
             try
             {
                 try
                 {
                     //This will also create Program.DATAFOLDER if it does not exist
-                    instance = new SingleInstance(ApplicationName, Program.DATAFOLDER);
+                    Instance = new SingleInstance(ApplicationName, Program.DATAFOLDER);
                 }
                 catch (Exception ex)
                 {
@@ -251,7 +247,7 @@ namespace Duplicati.Server
                     }
                 }
 
-                if (!instance.IsFirstInstance)
+                if (!Instance.IsFirstInstance)
                 {
                     if (writeConsole)
                     {
@@ -260,10 +256,16 @@ namespace Duplicati.Server
                     }
                     else
                     {
-                        throw new Exception(Strings.Program.AnotherInstanceDetected);
+                        throw new SingleInstance.MultipleInstanceException(Strings.Program.AnotherInstanceDetected);
                     }
                 }
 
+                if (commandlineOptions.ContainsKey("log-file"))
+                {
+                    if (System.IO.File.Exists(commandlineOptions["log-file"]))
+                        System.IO.File.Delete(commandlineOptions["log-file"]);
+                    Duplicati.Library.Logging.Log.CurrentLog = new Duplicati.Library.Logging.StreamLog(commandlineOptions["log-file"]);
+                }
 
                 Version sqliteVersion = new Version((string)Duplicati.Library.Utility.SQLiteLoader.SQLiteConnectionType.GetProperty("SQLiteVersion").GetValue(null, null));
                 if (sqliteVersion < new Version(3, 6, 3))
@@ -345,6 +347,14 @@ namespace Duplicati.Server
                 ServerStartedEvent.Set();
                 ApplicationExitEvent.WaitOne();
             }
+            catch (SingleInstance.MultipleInstanceException mex)
+            {
+                System.Diagnostics.Trace.WriteLine(string.Format(Strings.Program.SeriousError, mex.ToString()));
+                if (writeConsole)
+                    Console.WriteLine(Strings.Program.SeriousError, mex.ToString());
+                else
+                    throw mex;
+            }
             catch (Exception ex)
             {
                 System.Diagnostics.Trace.WriteLine(string.Format(Strings.Program.SeriousError, ex.ToString()));
@@ -361,8 +371,8 @@ namespace Duplicati.Server
                     Scheduler.Terminate(true);
                 if (WorkThread != null)
                     WorkThread.Terminate(true);
-                if (instance != null)
-                    instance.Dispose();
+                if (Instance != null)
+                    Instance.Dispose();
 
 #if DEBUG
                 //Flush the file
diff --git a/Duplicati/Server/SingleInstance.cs b/Duplicati/Server/SingleInstance.cs
index 86818201f..fbdeb572c 100644
--- a/Duplicati/Server/SingleInstance.cs
+++ b/Duplicati/Server/SingleInstance.cs
@@ -30,6 +30,40 @@ namespace Duplicati.Server
     /// </summary>
     public class SingleInstance : IDisposable
     {
+        /// <summary>
+        /// An exception that can be thrown to indicate a second instance was running
+        /// </summary>
+        [Serializable]
+        public class MultipleInstanceException : Exception
+        {
+            /// <summary>
+            /// Constructs the new exception
+            /// </summary>
+            public MultipleInstanceException()
+                : base()
+            {
+            }
+
+            /// <summary>
+            /// Constructs the new exception
+            /// </summary>
+            /// <param name="message">The message</param>
+            public MultipleInstanceException(string message)
+                : base(message)
+            {
+            }
+
+            /// <summary>
+            /// Constructs the new exception
+            /// </summary>
+            /// <param name="message">The message</param>
+            /// <param name="innerException">The inner exception</param>
+            public MultipleInstanceException(string message, Exception innerException)
+                : base(message, innerException)
+            {
+            }
+        }
+
         /// <summary>
         /// The folder where control files are placed
         /// </summary>