Server closed connection

everything seems to be working fine but in the log window it shows this...
 
[03:09:36] 150 Accepted data connection
[03:09:42] 1682 bytes transferred. (280 bytes/s) (00:00:05)
[03:09:42] 226-Options: -a -l 
[03:09:42] 226 14 matches total
[03:10:12] NOOP
[03:10:12] 200 Zzz...
[03:10:42] NOOP
[03:10:43] 200 Zzz...
[03:11:13] NOOP
[03:11:14] 200 Zzz...
[03:11:44] NOOP
[03:11:45] 200 Zzz...
[03:12:15] NOOP
[03:12:16] 200 Zzz...
[03:12:46] NOOP
[03:12:46] 200 Zzz...
[03:13:17] NOOP
[03:13:17] 200 Zzz...
[03:13:47] NOOP
[03:13:48] 200 Zzz...
[03:14:18] NOOP
[03:14:18] 200 Zzz...
[03:14:49] NOOP
[03:14:49] 200 Zzz...
[03:15:19] NOOP
[03:15:20] 200 Zzz...
[03:15:50] NOOP
[03:15:50] 200 Zzz...
[03:16:20] NOOP
[03:16:20] 200 Zzz...
[03:16:51] NOOP
[03:16:51] 200 Zzz...
[03:17:21] NOOP
[03:17:21] 200 Zzz...
[03:17:52] NOOP
[03:17:52] 200 Zzz...
[03:18:23] NOOP
[03:18:23] 200 Zzz...
[03:18:54] NOOP
[03:18:54] 200 Zzz...
[03:19:24] NOOP
[03:19:24] 200 Zzz...
[03:19:55] NOOP
[03:19:55] 200 Zzz...
[03:20:25] NOOP
[03:20:26] 200 Zzz...
[03:20:56] NOOP
[03:20:57] 200 Zzz...
[03:21:27] NOOP
[03:21:27] 200 Zzz...
[03:21:58] NOOP
[03:21:58] 200 Zzz...
[03:22:29] NOOP
[03:22:29] 200 Zzz...
[03:23:00] NOOP
[03:23:00] 200 Zzz...
[03:23:30] NOOP
[03:23:31] 200 Zzz...
[03:24:01] NOOP
[03:24:02] 200 Zzz...
[03:24:32] NOOP
[03:24:32] 200 Zzz...
[03:25:03] NOOP
[03:25:03] 200 Zzz...
[03:25:33] NOOP
[03:25:34] 200 Zzz...
[03:26:04] NOOP
[03:26:04] 200 Zzz...
[03:26:34] NOOP
[03:26:35] 200 Zzz...
[03:27:05] NOOP
[03:27:05] 200 Zzz...
[03:27:36] NOOP
[03:27:36] 200 Zzz...
[03:28:06] NOOP
[03:28:07] 200 Zzz...
[03:28:37] NOOP
[03:28:37] 200 Zzz...
[03:29:08] NOOP
[03:29:08] 200 Zzz...
[03:29:38] NOOP
[03:29:39] 200 Zzz...
[03:30:09] NOOP
[03:30:10] 200 Zzz...
[03:30:40] NOOP
[03:30:40] 200 Zzz...
[03:31:11] NOOP
[03:31:11] 200 Zzz...
[03:31:41] NOOP
[03:31:42] 200 Zzz...
[03:32:12] NOOP
[03:32:13] 200 Zzz...
[03:32:43] NOOP
[03:32:44] 200 Zzz...
[03:33:14] NOOP
[03:33:14] 200 Zzz...
[03:33:44] NOOP
[03:33:45] 200 Zzz...
[03:34:15] NOOP
[03:34:16] 200 Zzz...
[03:34:46] NOOP
[03:34:47] 200 Zzz...
[03:35:17] NOOP
[03:35:17] 200 Zzz...
[03:35:47] NOOP
[03:35:48] 200 Zzz...
[03:36:18] NOOP
[03:36:18] 200 Zzz...
[03:36:49] NOOP
[03:36:49] 200 Zzz...
[03:37:20] NOOP
[03:37:21] 200 Zzz...
[03:37:51] NOOP
[03:37:52] 200 Zzz...
[03:38:22] NOOP
[03:38:23] 200 Zzz...
[03:38:53] NOOP
[03:38:54] 200 Zzz...
[03:39:24] NOOP
[03:39:25] 200 Zzz...
[03:39:55] NOOP
[03:39:56] 200 Zzz...
[03:40:26] NOOP
[03:40:27] 421 Timeout (no operation for 1800 seconds)
[03:40:27] Server closed connection
 
Now my question is...as you can see at the end it says that the server closed the connection. and this happened about 30 minuites after i started the upload process. but even after it says that the connection was closed it is still uploading so everything seems like its working but was wondering why the log is showing this?
 

It's normal and expected. You can ignore the message, it's not an error and does not cause any problems. The transfer queue uses its own connections and your transfers won't be affected.