Same issue here 
Same issue here.
Roon Nucleus. Arc wonât connect to my core on my iPhone or iPad. Uninstalled on both and reinstalled. Still canât find my Core since last night. Otherwise Roon is working properly.
Roon Core Machine
I have Arc installed on an iPhone 13 pro running iOS 15.7.0 and it has been working well. Today I got the message âNo Roon Cores foundâ even though Roon is showing a connection to my core in settings and also confirms that Arc can securely access my Roon Core. I have deleted the Arc app and reinstalled it but keep getting the same message.
What is the solution?
Thanks.
Miles
Networking Gear & Setup Details
Connected Audio Devices
Number of Tracks in Library
Description of Issue
Roon Nucleus
Ethernet connected to router
Networking Gear & Setup Details
Sagecomm F@ST 5366TN router
ISP Optus Australia
Connected Audio Devices
Cambridge Audio CXN streaming DAC
Description of Issue
After last Roon software update, Roon ARC cannot find Roon Core (Roon Nucleus). Have tried rebooting Nucleus multiple times. Also deleted and reinstalled Roon ARC app on iPhone 12. No problems until last update.
Roon ARC settings on Roon is fine. States can connect with Core. See screenshots.
noted with thanks @AMT
I first was using Arc on my Mac with Roon Desktop. I needed to open up port forwarding on my modem and then Arc connected.
I now set up a Roon server, set up port forwarding, and Arc will not connect.
Everything is the same except Iâm using Server now.
Suggestions?
Thank you for pointing me to the tread. Looks like there may be a broader Roon server issue that is preventing Arc from finding my core.
Roon Core Machine
PC AMD Ryzen 9 3950X 16-Core Processor
Roon Version 2.9 (build 1148)
Networking Gear & Setup Details
-
Who is your internet service provider?
Swisscom -
Please list the make and model of your modem and router?
Internet-Box 3 -
Do you have any additional network hardware, like additional routers or managed switches?
WLAN-Box2 -
Does your network have any VPNs, proxy servers, or enterprise-grade security?
no
Connected Audio Devices
Iphone 12 (with Roon Arc and Roon remote)
Surface PC with RoonServer
PC with Roon Core
Description of Issue -
What is the exact port forwarding error message you see in the Roon Settings â ARC tab?
Roon Arc was working fine until the last few days when it occasionally disconnects from Roon Core.
But since yesterday, Roon Arc canât find the Roon Core anymore
âNo Roon Cores foundâ.
On Roon Core (PC), in the Roon Arc settings, it tells me that everything is ready.
Tried uninstalling,reset, reinstalling, digging into router settings, but everything is OK.
The ARC app canât find my Roon Core anymore!
Can You Help me?
Greetings
Thierry
Same issue here.
Others on Facebook have also facing this issue since today.
Same here! âNo Roon Cores foundâ Can anyone confirm this is happening right now?
I too am having the same issue since yesterday⊠Have tried everything. every uninstalled Roon, and tried again⊠tried a different router⊠the same issueâŠ
It seems more likely something at Roon endâŠ
I con not connect too!
So Iâve just come back from a 13 day trip to Tokyo, where Roon ARC has run flawlessly (I was even featured saying as much via Roonâs own socials!). With the update last week, I purposely avoided remotely doing the update, because it seems EVERY time an update is installed, I have to spend considerable time rejigging everything to get Roon ARC working again.
So this time when I landed back home, I did the most recent update and sure enough, as soon as everything rebooted, no Roon ARC functionality. Roon said it could still connect (and still says it can) but alas,no. Power reboots - no change. Update the port forwarding - no change. Re-install ARC - no change. Right now in ARC all it says is âNo Roon Cores foundâ.
I have factory reset everything at home despite no changes to network hardware or settings (except the Roon Core for obvious reasons) and still that one update of Roon has caused so much problems.
This is becoming a serious issue - as a Roon dealer I am getting incredibly reluctant to make clients aware of the ARC functionality for fear this will result in a refund of hardware/software.
The log reports no obvious changes to network or traffic infrastructure in the most recent update so I am at a loss as to what has happened. I was even using Roon ARC 10 mins before I started the update on a coffee run!
My Roon Arc worked normally last night, and today it also shows that it cannot be connected, but everything in the home network is normal, and the Arc test on Roon also shows that it is normal, but the mobile client cannot connect to the home core.
Seems a general issue on Roonâs side,
