Apparent DoS attack from PN ?

[#1]

Hi
I've just corrected my email entries in my new Netgear router and am getting one of these every couple of minutes.
[DoS attack: ACK Scan] from source: 84.93.229.133:14300
These are interspersed with other odd non-PN address, far more than I ever noticed with my previous router, when I might get a couple of odd ones a month.
Is there anything I can do to stop the PN ones and OOI what are they?
Cheers

[#2]

Further to the above, some are from port 80

[#3]

Quote

84.93.229.133

That's part of our mail platform, do you have anything set up that's automatically checking for mail?

[#4]

Hi
It looks as if my incorrect mail server setting initiated the reports and it took a few minutes to straighten itself out.
Thanks

[#5]

My hopes were premature !  This is just a small section of yesterday's log.
[DoS attack: ACK Scan] from source: 84.93.238.164:14300 Thursday, August 15,2013 06:18:51       
[DoS attack: ACK Scan] from source: 84.93.238.164:14300 Thursday, August 15,2013 06:18:14       
[DoS attack: ACK Scan] from source: 84.93.238.164:14300 Thursday, August 15,2013 06:17:38       
[DoS attack: ACK Scan] from source: 84.93.229.195:14300 Thursday, August 15,2013 05:48:21       
[DoS attack: ACK Scan] from source: 84.93.229.195:14300 Thursday, August 15,2013 05:47:43       
[DoS attack: ACK Scan] from source: 84.93.229.195:14300 Thursday, August 15,2013 05:47:06       
[DHCP IP: (192.168.0.5)] to MAC address 1C:5A:3E:4F:5C:D0 Thursday, August 15,2013 05:33:31       
[DoS attack: ACK Scan] from source: 84.93.238.68:14300 Thursday, August 15,2013 05:17:38       
[DoS attack: ACK Scan] from source: 84.93.238.68:14300 Thursday, August 15,2013 05:17:06       
[DoS attack: ACK Scan] from source: 84.93.238.68:14300 Thursday, August 15,2013 05:16:34       
[DoS attack: ACK Scan] from source: 84.93.229.227:14300 Thursday, August 15,2013 05:07:14       
[DoS attack: ACK Scan] from source: 84.93.229.227:14300 Thursday, August 15,2013 05:06:40       
[DoS attack: ACK Scan] from source: 84.93.229.227:14300 Thursday, August 15,2013 05:06:06       
[DoS attack: ACK Scan] from source: 84.93.229.131:14300 Thursday, August 15,2013 04:46:51       
[DoS attack: ACK Scan] from source: 84.93.229.131:14300 Thursday, August 15,2013 04:46:15       
[DoS attack: ACK Scan] from source: 84.93.229.131:14300 Thursday, August 15,2013 04:45:39       
[DoS attack: ACK Scan] from source: 84.93.238.164:14300 Thursday, August 15,2013 04:16:21       
[DoS attack: ACK Scan] from source: 84.93.238.164:14300 Thursday, August 15,2013 04:15:44       
[DoS attack: ACK Scan] from source: 84.93.238.164:14300 Thursday, August 15,2013 04:15:08       
[DHCP IP: (192.168.0.5)] to MAC address 1C:5A:3E:4F:5C:D0 Thursday, August 15,2013 03:55:35       
[DoS attack: ACK Scan] from source: 84.93.238.136:14300 Thursday, August 15,2013 03:45:51       
[DoS attack: ACK Scan] from source: 84.93.238.136:14300 Thursday, August 15,2013 03:45:15       
[DoS attack: ACK Scan] from source: 84.93.238.136:14300 Thursday, August 15,2013 03:44:39       
[DoS attack: ACK Scan] from source: 212.28.230.162:80 Thursday, August 15,2013 03:33:28       
[DoS attack: ACK Scan] from source: 84.93.229.69:14300 Thursday, August 15,2013 03:15:14       
[DoS attack: ACK Scan] from source: 84.93.229.69:14300 Thursday, August 15,2013 03:14:40       
[DoS attack: ACK Scan] from source: 84.93.229.69:14300 Thursday, August 15,2013 03:14:06       
[DoS attack: ACK Scan] from source: 84.93.238.228:14300 Thursday, August 15,2013 02:44:52       
[DoS attack: ACK Scan] from source: 84.93.238.228:14300 Thursday, August 15,2013 02:44:14       
[DoS attack: ACK Scan] from source: 84.93.238.228:14300 Thursday, August 15,2013 02:43:37       
[DoS attack: ACK Scan] from source: 212.28.230.162:80 Thursday, August 15,2013 02:20:29       
[DoS attack: ACK Scan] from source: 84.93.229.69:14300 Thursday, August 15,2013 02:14:28       
[DoS attack: ACK Scan] from source: 84.93.229.69:14300 Thursday, August 15,2013 02:13:49       
[DoS attack: ACK Scan] from source: 84.93.229.69:14300 Thursday, August 15,2013 02:13:11       
[DoS attack: ACK Scan] from source: 84.93.238.168:14300 Thursday, August 15,2013 01:44:07       
[DoS attack: ACK Scan] from source: 84.93.238.168:14300 Thursday, August 15,2013 01:43:35   
Has anyone an explanation please ?
Cheers

[#6]

Hi there,
ACK hints that the server is trying to respond to something, so either there is something on your network trying to access your mail via IMAP or packets are getting dropped somewhere - if you're not seeing many errors on your router stats then chances are it's the former and something is trying to get mail which the ACKs are in response to.

[#7]

Thanks for the pointer. It was my wife's new out of control tablet.  Now tamed.