No response to TCP SYN (no replies)

I have Wamp 3.0.6 on Windows 10 (64-bit)
Apache/2.4.23 (Win64) PHP/5.6.25 - Port defined for Apache: 80

I am not getting ACKs to TCP Syn requests on port 80, even on my LAN. My Wamp is completely green light. I can browse to my localhost/www pages.
I have collected a PCAP
------
1748 46.912379 192.168.1.101 192.168.1.129 TCP 66 63536 → 80 [SYN] Seq=0 Win=8192 Len=0 MSS=1260 WS=256 SACK_PERM=1
1749 47.164434 192.168.1.101 192.168.1.129 TCP 66 63537 → 80 [SYN] Seq=0 Win=8192 Len=0
MSS=1260 WS=256 SACK_PERM=1
1851 49.937856 192.168.1.101 192.168.1.129 TCP 66 [TCP Retransmission] 63536 → 80 [SYN] Seq=0 Win=8192 Len=0 MSS=1260 WS=256 SACK_PERM=1
1852 50.241287 192.168.1.101 192.168.1.129 TCP 66 [TCP Retransmission] 63537 → 80 [SYN] Seq=0 Win=8192 Len=0 MSS=1260 WS=256 SACK_PERM=1
----
My destination of my WAMP is 192.168.1.129

My httpd apache is PID 4996 and it is indeed listening.
$ netstat -ano | grep 4996
TCP 0.0.0.0:80 0.0.0.0:0 LISTENING 4996
TCP [::]:80 [::]:0 LISTENING 4996

What could be my next steps? I have an out-of-the-box windows distro on a brand new server -- I have not installed any additional ACL or malware software.

Any direction would be much appreciated.
Chip Bourne