Server/ARC not detected by Galaxy S21 Ultra after setup change (ref#A0A07U)

Support
1

What’s happening?

· I'm having trouble with Roon ARC

What best describes your issue with ARC

· I can't log into ARC but I can log into Roon

How can we help?

· None of the above

Other options

· Other

Describe the issue

Since I changed my set-up so that I no longer use a streamer (only using my Dell XPS-15 laptop) and no longer use a DAC or Preamp (only using a RDL HR-DSX4 selector) my Galaxy S21 Ultra cannot pick up the server/ARC, although I have the app installed on the phone. Can you assist.

Describe your network setup

I am a user of Virgin Media, and I have their Volt Gig1Broadband package.

2

What mechanism did you use for ARC connectivity?

The choices are:

  1. Port forwarding configured automatically using uPNP/natPMP
  2. Port forwarding configured manually on your router
  3. Tailscale running on your Roon Server

Knowing which of these is relevant will allow us better understand the possible causes of your issue. In the case of a port forwaring setup (the first two options above), posting the diagnostic text shown in the Roon → Settings → Roon ARC page of the normal Roon client (not ARC) will also help.

Also, is Roon Server running on the same Dell XPS-15 laptop or is it a separate device?

What router are you using? A VM Home Hub 4 or 5?

How is the Roon Server machine connected to your router?

3

Hello @DESMOND_BAILEY

Thank you for reaching Roon support — nice to see you in our community again!

Please follow the steps below to ensure Roon ARC functions properly on your Samsung device:

1. Battery Optimization
Samsung’s battery management may kill background apps or restrict network access:

  • Go to Settings > Apps > Roon ARC > Battery
  • Set to Unrestricted (not “Optimized” or “Restricted”)

2. App Permissions
Make sure ARC has all the necessary permissions:

  • Go to Settings > Apps > Roon ARC > Permissions
  • Allow Local Network, Storage, and Location if prompted (sometimes required for local discovery)

3. Data Usage / Network Access

  • Go to Settings > Apps > Roon ARC > Mobile Data & Wi-Fi
  • Enable both “Allow background data usage” and “Allow data usage while Data Saver is on”

4. Device Care / App Protection
Samsung’s Device Care features may restrict ARC:

  • Go to Settings > Device Care > Memory, and exclude ARC from auto-optimization
  • In Settings > Device Care > Battery > Background Usage Limits, remove ARC from any sleeping or deep sleeping app list

5. App Security / Secure Folder
If you’re using Samsung Knox or Secure Folder, ensure ARC is not sandboxed or blocked.

6. Clear App Data and Cache (if issues persist):
If the above steps don’t help, try clearing app data and cache:

  • Go to Settings > Apps > Roon ARC
  • Tap Storage
  • Tap Clear Cache, then Clear Data
  • Relaunch the app and try signing in again

Additionally please share the information requested in @Wade_Oram post.

Let us know how it goes!

4

Just to say a huge THAN K YOU for your kind help and guidance. All is now well and running perfectly.

1 Like
5

Glad to hear @DESMOND_BAILEY and thanks for letting us know! Please reach out in a new topic thread if anything comes up.