SENSE vs SYN Flood ??

I'm still trying to figure out why my internet connection is either extremely slow or not working at all while SENSE is protecting my devices. I checked the router firewall log, and looks like this, what is my SENSE router (192.168.0.4) doing?
Firewall Log
Description Count Last Occurence Target Source
SYN Flood 9 Fri Jul 21 18:55:48 2017 209.10.120.50:443 192.168.0.4:55312
SYN Flood 13 Fri Jul 21 18:57:48 2017 40.114.149.220:443 192.168.0.4:38609
SYN Flood 25 Fri Jul 21 19:04:58 2017 207.46.194.33:443 192.168.0.4:47526
SYN Flood 39 Fri Jul 21 19:19:22 2017 216.58.211.142:80 192.168.0.4:48477
SYN Flood 147 Fri Jul 21 19:38:20 2017 40.114.149.220:443 192.168.0.4:41081
SYN Flood 163 Fri Jul 21 19:59:03 2017 34.249.153.67:8886 192.168.0.4:52101
SYN Flood 108 Fri Jul 21 20:12:32 2017 216.58.211.131:443 192.168.0.4:36054
SYN Flood 116 Fri Jul 21 20:31:10 2017 216.58.211.138:443 192.168.0.4:60576
SYN Flood 1 Fri Jul 21 22:22:10 2017 193.110.109.216:80 192.168.0.4:43832
SYN Flood 41 Fri Jul 21 22:30:38 2017 54.221.141.103:80 192.168.0.4:59130
SYN Flood 1 Fri Jul 21 22:33:52 2017 185.33.223.215:80 192.168.0.4:59324
SYN Flood 11 Fri Jul 21 22:35:11 2017 192.229.163.249:80 192.168.0.4:59521
SYN Flood 17 Fri Jul 21 22:40:03 2017 93.184.216.34:80 192.168.0.4:58361
SYN Flood 28 Fri Jul 21 22:42:56 2017 216.58.211.142:443 192.168.0.4:58505
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Hello,
Sorry for my reply.
Because there maybe indeed something as trouble based on SENSE-router.
But .... also based on Google Search -> some of provided IPs ((at least, two of first ones)) related with AVG (?!); Does there possible that Firewall (by AVG) or their another software installed under your devices.
Or with another layer of network - there can be any security features as DDOS-protection or so?
If some of this "technologies" detected SENSE connection (check URL/website ratings/analyzing) as something suspicious - maybe they block it/ban it (for some time)?
Thanks.
AVG PC TuneUp is the only product from AVG that is installed in few machines, and it does not have a firewall function in it. Instead, Norton Security is still in every machine, could that be the reason...?
Well wasn't one of the reasons for buying sense that you get the app for every device.
Also you could now just sell the remaining norton protection to someone, so it doesn't go to waste.
Also remove the avg products for a test to see if it helps with the problem.
Well, basically yes, but will not sell Norton license before I see that SENSE works... I will remove AVG PC TuneUp today from all machines, and disable Norton, to see if they have something to do with problems
Just as clarification -> I'm also only F-Secure user and this is only my own suggestions; Good if there will be normal and proper official response from F-Secure SENSE team (who definitely know how it works and about potential troubles);
Maybe - as it was suggested - you able to re-check with temporary "disable"-status (or so) for Norton Security (or potentially related features);
But....
Based on your another topic: https://community.f-secure.com/t5/F-Secure-SENSE/SENSE-whines-about-no-connection/td-p/96330
Where you noted "Cisco cable modem (EPC3825 Eurodocsis 3.0 / Sonera)" - I able to think that you able to re-check this point too;
Based on brief Google Search --> it possible that this certain unit can be as modem/router (?!) and with certain features (which can be activated or not) like DDOS protection and other 'firewall'-rules;
Also not clear - your information about "SYN Flood" under logs - comes from ?!?!;
I think that "this one who marked it as "SYN Flood" situation" -> most likely able to prevent "src" (SENSE Router - as I able to understand) to do this; And block/ban temporary or globally; More looks as "false positive" about SENSE design activities;
Thanks.
If you can and if you already haven't, you should also but cisco cable modem/cable modem's port in bridge mode so it doesn't interfere with sense at all.
Cisco's cable modem does not support bridge mode...