tcpdump on my router shows a lot of unanswered TCP-SYN packets :
Times are in AEST-10
22:34:26.004710 IP xbox.crispi.com.50216 > ec2-54-75-181-120.eu-west-1.compute.amazonaws.com.https: Flags, seq 3210252385, win 65535, options [mss 1460,nop,wscale 8,nop,nop,sackOK], length 0
22:34:26.134288 IP xbox.crispi.com.50217 > ec2-99-80-249-139.eu-west-1.compute.amazonaws.com.https: Flags, seq 3446227876, win 65535, options [mss 1460,nop,wscale 8,nop,nop,sackOK], length 0
22:34:27.135646 IP xbox.crispi.com.50217 > ec2-99-80-249-139.eu-west-1.compute.amazonaws.com.https: Flags, seq 3446227876, win 65535, options [mss 1460,nop,wscale 8,nop,nop,sackOK], length 0
22:34:29.136818 IP xbox.crispi.com.50217 > ec2-99-80-249-139.eu-west-1.compute.amazonaws.com.https: Flags, seq 3446227876, win 65535, options [mss 1460,nop,wscale 8,nop,nop,sackOK], length 0
22:34:29.199333 IP xbox.crispi.com.50218 > ec2-99-80-249-139.eu-west-1.compute.amazonaws.com.https: Flags, seq 254109595, win 65535, options [mss 1460,nop,wscale 8,nop,nop,sackOK], length 0
Times are in AEST-10
22:34:26.004710 IP xbox.crispi.com.50216 > ec2-54-75-181-120.eu-west-1.compute.amazonaws.com.https: Flags
22:34:26.134288 IP xbox.crispi.com.50217 > ec2-99-80-249-139.eu-west-1.compute.amazonaws.com.https: Flags
22:34:27.135646 IP xbox.crispi.com.50217 > ec2-99-80-249-139.eu-west-1.compute.amazonaws.com.https: Flags
22:34:29.136818 IP xbox.crispi.com.50217 > ec2-99-80-249-139.eu-west-1.compute.amazonaws.com.https: Flags
22:34:29.199333 IP xbox.crispi.com.50218 > ec2-99-80-249-139.eu-west-1.compute.amazonaws.com.https: Flags