Port 17300 probes?

[incidents () mwwm net]

Since January I have logged the following  probes of port 17300; is 
this a known?

-------GMT----
Jan  4 11:16:20  212.143.36.64:1530 -> 17300
Jan  4 12:13:05  212.143.36.64:1744 -> 17300
Jan 21 23:37:58  24.95.177.30:4979 -> 17300
Jan 26 05:49:46  216.40.195.83:17300 -> 17300
Jan 29 16:39:20  12.212.35.44:4861 -> 17300
Feb 15 23:02:22  220.88.89.170:3252 -> 17300
Feb 15 23:09:08  217.210.222.213:1347 -> 17300
Feb 15 23:16:16  211.194.95.150:1062 -> 17300
Feb 21 00:29:12  61.77.241.204:4997 -> 17300
Feb 21 01:17:22  220.77.194.249:3226 -> 17300
Feb 21 09:50:25  61.248.164.86:4385 -> 17300
Feb 27 11:03:55  24.77.128.66:1461 -> 17300
Mar  1 09:34:03  131.128.137.177:3003 -> 17300
Mar 26 13:10:26  209.40.101.170:17300 -> 17300
Apr 10 18:23:42  217.121.239.168:4299 -> 17300
Apr 13 18:10:14  212.118.6.209:3507 -> 17300
Apr 13 20:38:01  209.40.97.21:17300 -> 17300
Apr 14 05:19:10  61.238.101.155:2507 -> 17300
Apr 14 06:17:51  218.252.139.30:2254 ->  17300



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