NET-158: Try to handle intermediate return code during authentication

git-svn-id: https://svn.apache.org/repos/asf/jakarta/commons/proper/net/branches/JDK_1_5_BRANCH@544992 13f79535-47bb-0310-9956-ffa450edef68

Author: Rory Winston

src/main/java/org/apache/commons/net/ftp/FTPClient.java

@@ -664,7 +664,16 @@ public boolean login(String username, String password) throws IOException
         if (!FTPReply.isPositiveIntermediate(_replyCode))
             return false;
 
-        return FTPReply.isPositiveCompletion(pass(password));
+        int replyCode = pass(password);
+        boolean replyOk = FTPReply.isPositiveCompletion(replyCode);
+        
+        // Work around stupid servers that send a 451 here
+        if (!replyOk && (replyCode == FTPReply.ACTION_ABORTED)) {
+        	replyCode = getReply();
+        	replyOk = FTPReply.isPositiveCompletion(replyCode);
+        }
+        
+        return replyOk;
     }