Benjamin, network issues appear to be silver bullet excuse. If it is so sensitive and fragile, why opting for it. My network is setup according to ROON recommendations. I have ASUS RT-AX88 PRO router is connected to a smart switch where I have three separate VLANs configured. Everything related to audio is connected to a same VLAN no crossing VLANs nor subnets, it is completely isolated. Port is defined as TRUNK so that it does not impede with internet traffic for any of VLANs. Entire ROON setup, INTEL NUC with 256 Gb SSD and 32 RAM, Synology NAS, PC with ROON Remote client running on Windows 11, Denafrips ARCAS network Streamer, Hegel H390 are connected to the same VLAN. Also IGMP Snooping is enabled as per recommendations. Attached is the screen shot of versions of ROON software, I’m not sure about RAATServer, but am assuming ROON should take care of it when updating version for the rest of the software. If it does not, it definitely is ROON problem not mine.
I'm not sure that I understand what you are telling about Antivirus and/or Firewall blocking. I have no firewall rules enabled, nor I do have Antivirus running, all are turned off at the moment. If i go to ROON Account login web site and complete login without a problem it indicates that firewall and antivirus is allowing that traffic to go back and forth.
After restoring from backup ROON is connected to ROON server. It identified all of the tracks in my library, but apparently is stuck on the one of the subsequent steps, either collecting metadata, cover images, organizing. It is running for about 24 hours, and there is no apparent way to close it and restart it, unless there is some secret command.

Also it does not allow me to connect TIDAL service. I do have valid TIDAL account, but when it does go through ROON verification process it fails each and every time. Obviously there is something corrupted within ROON process that prevents it from completing above processes.
I understand that I have large DB with over 185K tracks, and that probably takes substantial amount of time to complete entire process but 24 hours is way more than sufficient time, if not there is something inherently wrong with the process where ROON bit more than it can chew. My network is definitely defined as private network
Just would like to emphasize that at the moment, I can play music only from my local library, and it is working fine, no dropouts or interruptions. I cannot stream using TIDAL for above mentioned reason. Also the process identifying metadata, images is running constantly in the background without any apparent intention of comming to an end. Also just to make another test I have added new album to the Synology NAS last night. This morning I checked new album is picked up by ROON, and can be played without problem, but without cover image. Also search doe not work , most likely because process did not complete indexing so that it can work efficiently.
Hoping we can resolve this challenge I’m facing.