What is the operating system of your Roon Server host machine?
· Nucleus
What kind of device are you using to perform the login?
· iOS
Where are you trying to login?
· I can't log into Qobuz
Please try to restart your Roon Server by closing the Roon Server app in the taskbar (MacOS), task manager (Windows) or rebooting your Roon Server machine.
· No, the issue remains the same
Different device
· I am able to switch to the diffrent device
Are you still facing the issue on the different device
· No, the issue remains the same
Record the timestamp
· April 14th 17h02m European time (+1GMT)
Describe the issue
When using Roon arc on iPhone or CarPlay I get the message . I am using a nucleus one and iPad or iPhone as remote with a Linn Majik DSM ore Apple HomePods at home. This works fine no trouble playing music. Roon Arc works with my own library or Tidal but since Qobuz is my preferred source most music won’t play when playing through CarPlay. Arc also won’t play Qobuz music when using wifi
Describe your network setup
KPN fiber. Fritz!Box 7590 direct wired connection with nucleus one.
Thanks so much for taking the time to write in and share your report! Sorry to hear about your playback issues with Arc. Does this only occur when attempting to play via carplay?
Or, are you not able to stream Qobuz content from Arc with any output?
We were able to review a fresh diagnostic report from your recent Arc sessions, and observed the following problems happening simultaneously:
[RAAT] Error in AudioUnitInitialize: 560557684 (!int) — repeated dozens of times. This is an iOS audio session initialization failure. The error code !int means "not initialized", so in this case the audio unit (car play) can't be set up, which directly explains why Qobuz tracks won't play.
FTMSI-B-OE / ConnectionError / "Network write failure" — a stream for a Qobuz track ("La fontaine de sang") failed mid-transfer with a network write error, suggesting the connection to Qobuz's CDN is being interrupted.
Low memory reported by the Flutter framework — the app was under memory pressure around the same time, which can cause audio session failures on iOS.
Let’s see if any of the following steps help you:
Force-quit and reopen Roon Arc on your iPhone, then try playing Qobuz before connecting to CarPlay. If it plays on the phone directly, then connect CarPlay. The audio session handoff to CarPlay is where initialization is failing.
Check your Qobuz streaming quality setting in Arc — go to Arc Settings → Audio Quality via cellular and try dropping to a lower quality. See if the same issues occur.
On your iPhone, go to Settings → Privacy & Security → Microphone, and make sure Roon Arc has microphone/audio session permissions. CarPlay audio routing sometimes requires this.
On your Fritz!Box, check whether you have any traffic shaping or QoS rules that might be throttling streams from Qobuz's servers specifically. The network write failure on the Qobuz track suggests the connection is being cut — Fritz!Box 7590 can sometimes be aggressive with long-lived streaming connections.
In Roon on your Nucleus, go to Settings → Services → Qobuz and re-authenticate (sign out and sign back in). Token refresh issues can cause intermittent stream failures, specifically for Qobuz.
If none of the above help, delete and reinstall Roon Arc on your iPhone. Check if a completely fresh instance of Arc helps.
Thank Sander, we’ll be monitoring for your reply! 👍
Thanks for the suggestions. I already did a force-quit with no success. Until now it wasn’t only CarPlay but also Arc on my IPhone. I just removed and reinstalled the app on my iPhone and can play music from Qobuz through my iPhone. I will try Arc via CarPlay tomorrow. For now it seems that reinstalling solved the problem but will get back to you tomorrow.
Thank you for the update and for providing the screenshot. You were completely spot on regarding the timing!
The “Problem communicating with Qobuz” error you experienced in ARC was directly tied to the recent infrastructural issues Qobuz had with their Akamai content delivery servers.
The good news is that Qobuz’s engineering team has fully resolved this problem on their end. Since the fix was implemented on their servers, everything should now be functioning normally without you needing to change any settings or reinstall the app again.
Could you please give Qobuz playback via ARC another try (on both your iPhone and via CarPlay) and let us know if the issue is fully resolved for you?
Sorry, Since the screenshot I have tried it frequently and every single time I get the same response: “problem communicating with Qobuz”. Even one minute a go. It doesn’t matter if I am using wifi (my own or elsewhere) or cellular. When using the Qobuz app the music plays normally.
@vadim - I think you are confusing this ARC communication issue with the issue that Qobuz had with their CDN, which affected all of Roon, not just ARC.
The CDN issue has indeed been resolved, but the ARC communication issue is an ongoing problem.
We are looking into this issue with Qobuz’s help, for the latest updates, please see this thread:
I will shortly close this thread and move your post into the main tracking thread so that you are notified when there are further updates to share, thank you!