I am in a Creative Services workgroup connected to a WD MyCloudPR4100 that IT has setup to be our group's NAS.

The issue is that occasionally the Macs in the group will lose their WiFi connection to the NAS while working, spin, hang and freeze. The PC's like mine in the group aren't experiencing anything like this issue - but they are hardwired into the NAS over ethernet.

I'm trying to determine weather this is a Mac, Network or NAS issue - and I'm far from a network expert - but I'm the best hope my group currently has.

Does anyone have any advice or resources that might be useful in diagnosing this problem?


Network (WiFi)

I usually start by eliminating things from the problem to help simplify the overall troubleshooting exercise. I'd start with the WiFi because I've seen it be the source of problems more times than I'd like to admit. You can use tools such as PingPlotter (free for basic use).


NOTE: I generally just keep this running all day long, the vertical red bars are when I encountered network drops between myself and the WiFi access point.

There are other methods I'll use to do something similar to this, For example you can use the terminal application mtr which I highlight here as well - How does MTR (run with TCP protocol) calculate the loss rate?]3.

If you find you're having issues and have the ability to use Ethernet instead, you can try switching to a physical Ethernet connection to see if the problem goes away or is mitigated.


If you've progressed past eliminating the WiFi as the problem, look next to the NAS storage connection that the macOS systems are using to communicate with the NAS.

Here you'll want to see what protocol is being used to establish the connection. Is it Samba (SMB), is it NFS or is it something else. Each of these can be problematic in their own unique ways. If you find it's one of these, then understand the stack of software that is constructing this connection from your client Macs to the NAS and verify they're using the latest versions and dig into any logs they may provide.

I can go on but this should get you started in the general direction.

  • This looks like a great starting point - thanks. – Joshjurg Apr 16 '19 at 17:27
  • @Joshjurg - good luck, keep updating the Q as you gain more details, I can keep helping w/ the triage if you want. I do this all day. – slm Apr 16 '19 at 17:40

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