OpenShift router not receiving traffic after setting DROP_SYN_DURING_RESTART

Issue

• No web traffic is making it to OpenShift routers after enabling the DROP_SYN_DURING_RESTART environment variable.
• Clients are hanging after configuring DROP_SYN_DURING_RESTART.
• Router pod goes into CrashLoop due to failing health checks:

Feb 03 13:34:07 node.example.com atomic-openshift-node[11129]: I0203 13:34:07.228492   11129 prober.go:111] Readiness probe for "router-19-vdjq2_default(e723c7b0-27e1-11e9-a4d6-0050568b43c8):router" failed (failure): Get http://localhost:1936/healthz: net/http: request canceled (Client.Timeout exceeded while awaiting headers)