How to reproduce:
1. Open the attached project
2. Simulate network latency (tested with Clumsy)
2. Build & Run the project
3. In the built project select "Lan Server Only(S)"
4. In the Editor enter Play mode
5. Select "Lan Client(C)"

Actual result: NetworkTransport.GetRemoteDelayTimeMS returns 0 in the console.
Expected result: NetworkTransport.GetRemoteDelayTimeMS should return the delay time.

Reproduced with: 2017.3.0a4, 2017.2.0b6, 2017.1.0p3, 5.6.3f1, 5.5.4p2.

Note: Rarely, the delay is correct.