Index: src/app/qgsnewconnection.cpp
===================================================================
--- src/app/qgsnewconnection.cpp	(revision 12347)
+++ src/app/qgsnewconnection.cpp	(working copy)
@@ -126,6 +126,23 @@
 void QgsNewConnection::saveConnection()
 {
   QSettings settings;
+
+  // check for existing connection with same name
+  settings.beginGroup( "/PostgreSQL/connections" );
+  QStringList keys = settings.childGroups();
+  if ( keys.contains( txtName->text() ) )
+  {
+    int res = QMessageBox::question( this,
+                                     tr( "Save connection" ),
+                                     tr( "Conection with name %1 already exists. Overwrite?" ).arg( txtName->text() ),
+                                     QMessageBox::Yes | QMessageBox::No );
+    if ( res != QMessageBox::Yes )
+    {
+      return;
+    }
+  }
+  settings.endGroup();
+
   QString baseKey = "/PostgreSQL/connections/";
   settings.setValue( baseKey + "selected", txtName->text() );
   //delete original entry first