Yes, either remove it, or set the value to 0, the default behaviour of Windows, see https://support.microsoft.com/en-us/kb/926179.
Done.
Clearly you are on IPv6, and for sure IPv6 UDP decapsulation won't work by no means on your server, for this to know, we need only to read the initial section of your last connection log:
The main problem for me that I didn't use IPv6
In addition, something is occupying already the IPv4 port 500 and/or 4500, and for this reason IPv4 has been disabled.
Sockstat output:
Code:
(pts/3)[root@server:/usr/local/etc]# sockstat | grep 500
root charon 10816 11 udp4 6 *:500 *:*
root charon 10816 12 udp4 6 *:4500 *:*
root ntpd 1500 3 dgram -> /var/run/logpriv
root ntpd 1500 20 udp4 *:123 *:*
root ntpd 1500 21 udp4 10.0.0.1:123 *:*
root ntpd 1500 22 udp4 192.168.1.1:123 *:*
root ntpd 1500 23 udp4 127.0.0.1:123 *:*
root ntpd 1500 24 udp4 85.113.221.175:123 *:*
root ntpd 1500 28 udp4 10.1.200.1:123 *:*
root ntpd 1500 29 udp4 10.20.0.5:123 *:*
root rtorrent 1470 13 tcp4 127.0.0.1:5000 *:*
root mpd5 1331 16 tcp4 127.0.0.1:5005 *:*
Are you connected via DS-Lite, or do you have a real IPv6 address? If you can't disable NAT then you will be on a dead end here. FreeBSD is not able to do IPv6 UDP decapsulation.
Your options are getting rid of DS-Lite, by switching either to pure IPv6 without NAT or to IPv4 (with or without NAT).
Server ip: 85.113.221.175 (static via PPPoE)
My external ip: 2.93.190.121 (dynamic)
My internal ip: 192.168.42.145 (behind NAT (OpenWRT router))
I use standard Win7 network manager.
No IPv6.