Roon Arc Buffering

Roon Server Machine

Roon Server Version 2.0 (Build 1432) Production
Mac Studio 2022, Apple M1 Ultra, Memory 128 GB, macOS Sonoma 14.5.0

Networking Gear & Setup Details

ASUS GT-AXE 16000 Wireless Router, WiFi only, no VPN

  1. Who is your internet service provider? Frontier Communications, Fiber 1 Gig Internet, 1000/1000 Mbps wired speed.

  2. Please list the make and model of your modem and router? ASUS GT-AXE 16000

  3. Do you have any additional network hardware, like additional routers or managed switches? No, only ASUS router.

  4. Does your network have any VPNs, proxy servers, or enterprise-grade security? No VPNs

Connected Audio Devices

RoonARC 1.0 (276) on iPhone 15 Pro using iOS 17.5.1

Description of Issue -

Hello, I am having issues using RoonARC on my iPhone. Specifically, I am finding my music starts playing, then stopping as it buffers to then start playing again. This happens while my iPhone is on cellular but not when connected to WiFi. I have T-Mobile on the 5GUC spectrum, testing out the speed with downloads at 1,467 Mbps and Uploads at 95.4 Mbps. My cellular connection is not being throttled, as my other media services play without interruption. However, on WiFi connection I have no connectivity issues on RoonARC as of yet.

My music library is stored on my MacStudio with the Roon Server installed. They are connected to my ASUS GT-AXE 16000 on wifi only. I have no VPN nor any other network setup. On my ASUS I have Port Forwarding set to 55002 External & Internal Ports using the same IP Address listed in the Roon Server. I have UPnP turned off and IPv6 Disable.

Are there other settings I should note and/or change? Testing my RoonARC says Ready, so it doesn’t appear to be the server issue. My interruption/buffering happens on the cellular network, but this has only happened recently this week. I’ve never had this issue before hand. I suspect it could be the ASUS perhaps slowing down/limiting the bandwidth of Roon, but not sure how to confirm this.

Has anyone else seen this issue before?

As another T-Mobile user (via Google Fi in my case): their network provisioning and management is very uneven. Speed tests do not tell you the story that matters to ARC, it’s designed to measure bulk bandwidth, which can have temporary hiccups, not streaming, which cannot. Cellular latency can go from decent to terrible in a few minutes, like when a crowd are all using the same cell site (such as in traffic jams). I’ve been able to stream ARC reasonably when driving in the Bay Area, but I don’t even bother trying if I’m stuck in traffic.

Thank you Fernando for the info. I thought so too, that my T-Mobile connection at times could be unstable. I have my RoonARC settings for Playback set to Original Format for both WiFi and Cellular. Most of my music files are AIFF but I do have ALAC, FLAC, AAC, and MP3. I tried experimenting playing other formats since AIFF was initially causing that buffering issues. But even playing the other lossless and lossy file types and it still buffers over Cellular. I have a Qobuz account and when I play music over my Qobuz account on RoonARC there are no issues playing lossless over Cellular whatsoever. I still think my root cause might be my ASUS settings, maybe I have something inadvertently turned on.

Hi @Carlos_Cabezas ,

Thanks for reaching out with your report. I’ve activated diagnostics mode for your account and I am noticing a few signs of general networking instability at a Roon Server level, it looks like your Mac is sometimes even getting an error fetching the time:

[33990] 07/04 14:30:30 Trace: [realtime] fetching time from NTP server
[33991] 07/04 14:30:30 Trace: [realtime] Got invalid time from NTP: 1/1/1900 12:00:00AM (0ms)
[33992] 07/04 14:30:30 Warn: [realtime] Unexpected error: System.Exception: Got nonsense time from NTP
[33993] at Sooloos.RealTime._FetchTimeFromServer(ResultCallback`1 cb)

As well as authenticating with our servers:

[5038] 07/02 17:19:27 Trace: [devicemap] error updating device map: NetworkTimeout
[5039] 07/02 17:19:32 Warn: [easyhttp] [567] POST web exception without response: socketmsg (TimedOut): Operation timed out ( Operation timed out (
[5040] 07/02 17:19:32 Warn: [broker/accounts] failed to refresh account info: Result[Status=NetworkError]
[5041] 07/02 17:19:32 Warn: [easyhttp] [570] GET web exception without response: socketmsg (TimedOut): Operation timed out ( Operation timed out (

We have seen users with similar symptoms have a better experience in the past if they change their Router’s DNS servers from the ISP provided ones to Cloudflare DNS, Quad9 or Google DNS. Can you please give this a try and let us know if it helps?

I would also double-check to make sure you haven’t accidentally enabled another network interface on the Mac server

Thank you Noris, I’m not as familiar with assigning servers in my router … I typically leave the default settings albeit it for Port Fowarding for Roon Arc. Would this be the settings I would need to try and reassign the DNS?

If so, according to the Google DNS site (Get Started  |  Public DNS  |  Google for Developers), would there be any security issues using and as my DNS servers?

On a side note, I restarted my router and that seems to have corrected the issue, but since this has happened before I suspect I’ll run into the same buffering issues again.

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All the DNS providers @noris suggested are reputable and as secure as anything on the internet. On my routers (two locations) I set as primary DNS and as secondary (I could also have done it the other way round…) I don’t know if your router allows both primary and secondary DNS servers or just one, but anyway, one of the above will do the job.

Great, thank you Fernando. I’ve gone ahead and added the Google DNS that was part of the ASUS options when I Assign a DNS service:

@noris , I’ll test this latest settings on my RoonARC using cellular. Please let me know if you see any discrepancies or issues with networking instability on your end when activating the diagnostics mode for my account.

Thank you!

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