diff -r 9f0b95aafaa3 -r ed84c8bdd87b src/org/sonews/daemon/command/UnsupportedCommand.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/org/sonews/daemon/command/UnsupportedCommand.java	Sun Aug 29 17:28:58 2010 +0200
@@ -0,0 +1,67 @@
+/*
+ *   SONEWS News Server
+ *   see AUTHORS for the list of contributors
+ *
+ *   This program is free software: you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation, either version 3 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package org.sonews.daemon.command;
+
+import java.io.IOException;
+import org.sonews.daemon.NNTPConnection;
+
+/**
+ * A default "Unsupported Command". Simply returns error code 500 and a
+ * "command not supported" message.
+ * @author Christian Lins
+ * @since sonews/0.5.0
+ */
+public class UnsupportedCommand implements Command
+{
+  
+  /**
+   * @return Always returns null.
+   */
+  @Override
+  public String[] getSupportedCommandStrings()
+  {
+    return null;
+  }
+
+  @Override
+  public boolean hasFinished()
+  {
+    return true;
+  }
+
+  @Override
+  public String impliedCapability()
+  {
+    return null;
+  }
+
+  @Override
+  public boolean isStateful()
+  {
+    return false;
+  }
+
+  @Override
+  public void processLine(NNTPConnection conn, final String line, byte[] raw)
+    throws IOException
+  {
+    conn.println("500 command not supported");
+  }
+  
+}