Caching Server does not serve softwareupdates to 10.12.* Client machines.

Number:rdar://30311121 Date Originated:01-Feb-2017 10:59 AM
Status:Open Resolved:
Product:Server Product Version:5.2
Classification: Reproducible:Always
A caching server on 10.12.(2/3) with Server 5.2 installed will not serve Software Updates to clients on 10.12 requesting updates on the network. It will however cache and serve updates to clients on 10.11.*.

If a mac AppStore App or iOS device requests an install/update it is cached and served correctly.

Steps to Reproduce:
1. Install on 10.12.(2-3).
2. Turn on Caching and enable ClientIdentity Logging. 
3. Run AssetCacheLocatorUtil or restart a 10.12.(1-2) Client.
4. Run `softwareupdate -d -a`

Expected Results:
The client running `softwareupdate -d -a` should download updates from caching server.

Actual Results:
Caching Server doesn't notice a request fom the client and the client downloads from an Apple Peer at 17.253.17.*

Mac Mini (10.12.2-3) running (5.2)
Mac Mini (10.12.4) running (5.3)


This is fixed in 10.12.6 on the client side.

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