Index: /applications/editors/josm/plugins/openstreetbugs/src/org/openstreetmap/josm/plugins/osb/OsbPlugin.java
===================================================================
--- /applications/editors/josm/plugins/openstreetbugs/src/org/openstreetmap/josm/plugins/osb/OsbPlugin.java	(revision 23746)
+++ /applications/editors/josm/plugins/openstreetbugs/src/org/openstreetmap/josm/plugins/osb/OsbPlugin.java	(revision 23747)
@@ -29,4 +29,5 @@
 
 import static org.openstreetmap.josm.tools.I18n.tr;
+
 
 import javax.swing.ImageIcon;
@@ -189,5 +190,11 @@
                 }
             } catch (Exception e) {
-                JOptionPane.showMessageDialog(Main.parent, e.getMessage());
+                if (e instanceof java.net.UnknownHostException) {
+                    String message = String.format(tr("Unknown Host: %s - Possibly there is no connection to the Internet.")
+                            , e.getMessage());
+                    JOptionPane.showMessageDialog(Main.parent, message);
+                } else {
+                    JOptionPane.showMessageDialog(Main.parent, e.getMessage());
+                }
                 e.printStackTrace();
             }