Don't start ident server if previously failed

Change-Id: I1c222daecda5d2209f33906bfa1196f74ae72906
Reviewed-on: http://gerrit.dmdirc.com/2264
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Chris Smith <chris@dmdirc.com>

src/com/dmdirc/addons/identd/IdentdServer.java

     /** The plugin that owns us. */
     private final IdentdPlugin myPlugin;
 
+    /** Have we failed to start this server previously? */
+    private boolean failed = false;
+
     /**
      * Create the IdentdServer.
      */
      * Start the ident server
      */
     public void startServer() {
-        if (myThread == null) {
+        if (!failed && myThread == null) {
             try {
                 final int identPort = myPlugin.getConfig().getOptionInt(
                         myPlugin.getDomain(), "advanced.port");
                 myThread.start();
             } catch (IOException e) {
                 Logger.userError(ErrorLevel.HIGH, "Unable to start identd server: " + e.getMessage());
+                if (e.getMessage().equals("Permission denied")) {
+                    failed = true;
+                }
             }
         }
     }