Connect failed

I have a problem about connect to FTP host please see log.

[16:02:06] SmartFTP v3.0.1013.2
[16:02:08] Connect failed. Waiting to retry (30s)...
[16:02:39] Connection attempt 2...
[16:02:39] Connect failed. Waiting to retry (30s)...
[16:03:12] Connection attempt 3...
[16:03:12] Connect failed. Waiting to retry (30s)...
[16:03:43] Connection attempt 4...
[16:03:43] Connect failed. Waiting to retry (30s)...
[16:04:13] Connection attempt 5...
[16:04:13] Connect failed. Waiting to retry (30s)...
[16:04:44] Connection attempt 6...
[16:04:44] Connect failed. Waiting to retry (30s)...
[16:05:14] Connection attempt 7...
[16:05:14] Connect failed. Waiting to retry (30s)...
[16:05:45] Connection attempt 8...
[16:05:45] Connect failed. Waiting to retry (30s)...
[16:06:16] Connection attempt 9...
[16:06:16] Connect failed. Waiting to retry (30s)...
[16:06:46] Connection attempt 10...
[16:06:46] Connect failed. Waiting to retry (30s)...
[16:07:16] Connection attempt 11...
[16:07:16] Connect failed. Waiting to retry (30s)...
[16:07:46] Connection attempt 12...
[16:07:46] Connect failed. Waiting to retry (30s)...
[16:08:17] Connection attempt 13...
[16:08:17] Connect failed. Waiting to retry (30s)...
[16:08:47] Connection attempt 14...
[16:08:47] Connect failed. Waiting to retry (30s)...
[16:09:17] Connection attempt 15...
[16:09:17] Connect failed. Waiting to retry (30s)...
[16:09:48] Connection attempt 16...
[16:09:48] Connect failed. Waiting to retry (30s)...
[16:10:18] Connection attempt 17...
[16:10:18] Connect failed. Waiting to retry (30s)...
[16:10:49] Connection attempt 18...
[16:10:49] Connect failed. Waiting to retry (30s)...
[16:11:19] Connection attempt 19...
[16:11:19] Connect failed. Waiting to retry (30s)...
[16:11:49] Connection attempt 20...
[16:11:49] Connect failed. Waiting to retry (30s)...
[16:12:19] Connection attempt 21...
[16:12:20] Connect failed. Waiting to retry (30s)...
[16:12:50] Connection attempt 22...
[16:12:50] Connect failed. Waiting to retry (30s)...
[16:13:20] Connection attempt 23...
[16:13:20] Connect failed. Waiting to retry (30s)...
[16:13:50] Connection attempt 24...
[16:13:50] Connect failed. Waiting to retry (30s)...
[16:14:20] Connection attempt 25...
[16:14:20] Connect failed. Waiting to retry (30s)...
[16:14:51] Connection attempt 26...
[16:14:51] Connect failed. Waiting to retry (30s)...
[16:15:21] Connection attempt 27...
[16:15:21] Connect failed. Waiting to retry (30s)...
[16:15:51] Connection attempt 28...
[16:15:51] Connect failed. Waiting to retry (30s)...
[16:16:21] Connection attempt 29...
[16:16:21] Connect failed. Waiting to retry (30s)...
[16:16:51] Connection attempt 30...
[16:16:51] Connect failed. Waiting to retry (30s)...
[16:17:21] Connection attempt 31...
[16:17:22] Connect failed. Waiting to retry (30s)...
[16:17:52] Connection attempt 32...
[16:17:52] Connect failed. Waiting to retry (30s)...
[16:18:22] Connection attempt 33...
[16:18:22] Connect failed. Waiting to retry (30s)...
[16:18:52] Connection attempt 34...
[16:18:52] Connect failed. Waiting to retry (30s)...
[16:19:22] Connection attempt 35...
[16:19:22] Connect failed. Waiting to retry (30s)...
[16:19:52] Connection attempt 36...
[16:19:53] Connect failed. Waiting to retry (30s)...
[16:20:23] Connection attempt 37...
[16:20:23] Connect failed. Waiting to retry (30s)...
[16:20:53] Connection attempt 38...
[16:20:53] Connect failed. Waiting to retry (30s)...
[16:21:23] Connection attempt 39...
[16:21:23] Connect failed. Waiting to retry (30s)...
[16:21:53] Connection attempt 40...
[16:21:53] Connect failed. Waiting to retry (30s)...
[16:22:23] Connection attempt 41...
[16:22:24] Connect failed. Waiting to retry (30s)...
[16:22:54] Connection attempt 42...
[16:22:54] Connect failed. Waiting to retry (30s)...
[16:23:24] Connection attempt 43...
[16:23:24] Connect failed. Waiting to retry (30s)...
[16:23:54] Connection attempt 44...
[16:23:54] Connect failed. Waiting to retry (30s)...
[16:24:24] Connection attempt 45...
[16:24:25] Connect failed. Waiting to retry (30s)...
[16:24:55] Connection attempt 46...
[16:24:55] Connect failed. Waiting to retry (30s)...
[16:25:25] Connection attempt 47...
[16:25:25] Connect failed. Waiting to retry (30s)...
[16:25:55] Connection attempt 48...
[16:25:55] Connect failed. Waiting to retry (30s)...
[16:26:26] Connection attempt 49...
[16:26:26] Connect failed. Waiting to retry (30s)...
[16:26:57] Connection attempt 50...
[16:26:57] Connect failed. Waiting to retry (30s)...
[16:27:28] Connection attempt 51...
[16:27:28] Connect failed. Waiting to retry (30s)...


Please advice me.

Thank you very much