Thanks for writing in, and welcome to the community! Sorry to hear about your connection issues.
An easy first thing to test - bypass your network switches, and get a direct ethernet connection from your server directly to your primary router, and let me know if you run into the same issue.
Another area to investigate further - your windows fireall settings. Since you are using a Windows PC, I would verify that both Roon.exe and RAATServer.exe have been added as exceptions to your Windows firewall.
You can use these instructions to add the exceptions and the executables themselves would be located in your Database Location/Application folder path.
I would also add these exceptions to any Antivirus or other Firewall blocking applications you may have and ensure that you connected to your network via a Private network, not a Public one, see this guide for more information.
I am glad to say that the firewall exe. gave me the in to repair the mess I made. Seems that my airlens started messing up and would not be recognized. I bought and installed a Necleus as a solution, that led to a conflict with my puter that was set up as a server. After seting up another puter to lead my nucleus server all has started working again. Thanx for taking the time to help an old man who is not computer savy, but loves music!
Glad to hear that your connectivity is restored. Please let us know if we can help with anything else in a new topic thread, as this one will close automatically after a few days.