Unfortunately, the issue hasn’t been resolved for me. I already tried all of the mentioned steps including setting up a new roon instance with backup restore and Roon Arc (iOS) reinstallation. I cannot start from scratch due to many hours invested in library tagging.
Best regards,
Johannes
Please fill out the necessary system info below to get started:
Include your operating system and machine info (Model, CPU, RAM)
Your network gear (model of routers/switches) and if on WiFi/Ethernet
Specify what devices you’re using and their connection types, like USB/HDMI/Chromecast, etc.
Tell us how large your music library is, eg. “30,000 tracks”
Tell us about the problem you’re having in as much detail as possible. Screenshots are always appreciated!
DS720+. Synology DSM 7. 18 GB RAM.
DS720+ on Ethernet
Roon Remote functional. RoonArc used to work at launch. Not functional for > 0.5 years.
12k
Sync error at first synchronization on iOS (latest build). Database restore and RoonArc reinstallation tested. Disabled file tag genres.
To confirm, have you tested out running Arc on a fresh database temporarily? This would be a good thing to test out. You can always restore a fresh backup if need be (just make sure you have a recent backup saved!)
I also see you have a MacOS device you use as a Roon Remote. If possible, can you test out running this device as your Core, and see if you’re able to get Arc up and running?
I’ll be on standby for your reply.
It works with my Mac set up as server. I tried syncing with a new database (1 artist imported) and it worked usignthe Synology Roon SPK.
Settings> Roon ARC is ready. I also tested changing the port and setting up respective forwarding rules.
Hey @Johannes_Lohmeier,
Thanks for the update. I feel it important to mention that I’ve had to move your thread into #tinkering due to your core running via docker, and this setup is not officially supported by Roon.
That said, there are certainly folks on community with similar setups that may be able to provide additional knowledge for you.
Thanks for your understanding and you have my apologies in that I’m not able to provide any further troubleshooting steps. 
I just updated my last post. The error seems to be related to my music database and not the server settings. Could there be a particular file or tag causing this issue?
Hey @Johannes_Lohmeier,
You can always review your Roon core logs below, which may highlight corruption:
Here is the error:
08/01 20:09:04 Trace: [library/mobilesync] syncing profiles…
08/01 20:09:04 Trace: [library/mobilesync] 1 added, 0 updated, 0 removed
08/01 20:09:04 Trace: [library/mobilesync] syncing markers+metadata…
08/01 20:09:04 Trace: [library/mobilesync] 111308 added, 0 removed
08/01 20:09:04 Trace: [library/mobilesync] truncated to 50000 added, 0 removed
08/01 20:09:04 Trace: [library/mobilesync] syncing album ratings…
08/01 20:09:04 Trace: [library/mobilesync] 1 updated
08/01 20:09:04 Trace: [library/mobilesync] syncing playlists…
08/01 20:09:04 Trace: [library/mobilesync] 14 added, 0 updated, 0 removed
08/01 20:09:04 Trace: [library/mobilesync] syncing tags…
08/01 20:09:04 Trace: [library/mobilesync] 26 added, 0 updated, 0 removed
08/01 20:09:04 Trace: [library/mobilesync] syncing recents…
08/01 20:09:04 Trace: [library/mobilesync] 500 added
08/01 20:09:04 Trace: [library/mobilesync] 0 removed
08/01 20:09:04 Trace: [library/mobilesync] syncing locations…
08/01 20:09:04 Trace: [library/mobilesync] 6 added, 0 updated, 0 removed
08/01 20:09:04 Trace: [library/mobilesync] synced changes, incrementing 9:6faf7f45c10b4db9b39dfcc98ee661b2:0 to 9:6faf7f45c10b4db9b39dfcc98ee661b2:1
08/01 20:09:04 Trace: [library/mobilesync] sync completed in 346ms, response is 9987370 bytes
08/01 20:09:11 Info: [stats] 24405mb Virtual, 1935mb Physical, 1000mb Managed, 538 Handles, 192 Threads
08/01 20:09:26 Info: [stats] 23619mb Virtual, 1934mb Physical, 1060mb Managed, 538 Handles, 91 Threads
08/01 20:09:30 Critical: scx: System.ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection. (Parameter ‘index’)
at System.Collections.Generic.List1.get_Item(Int32 index) at Base.Extensions.PickRandom[T](IList1 items, Int32 N)
at Sooloos.Broker.Music.LibraryTasteSummary.GenerateTasteSummary(Profile profile)
at Sooloos.Broker.Music.LibraryTasteSummary.Clean(Profile profile)
at Sooloos.Broker.Music.LibraryTasteSummary.ev_check()
at Sooloos.CallingThread.<>c__DisplayClass23_0.b__1()
at Sooloos.SynchronizationContextThread._Dispatch(SendOrPostWrapper& ret)
@benjamin Any idea what’s the issue here?
08/01 20:09:30 Critical: scx: System.ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection. (Parameter ‘index’)
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