Hi Benjamin, nice to hear from one of Roon staff.
I use the Xfinity router (Comcast launches Wi-Fi 6 gateway, makes xFi Advanced Cybersecurity free - The Verge). I don’t think I am using the specific gear you mentioned. I do not have another router to test.
I checked the screenshots I took long before when Roon started having this problem. The DNS was also 75.75.75.75. So no changes. I’ve been using ROCK for about 8 to 9 months. During this duration, there were two major problems occurred, one of which was resolved by renaming Roon Server folder to Roon Server_old followed by rebooting the system and restoring a backup. This occurrence is the second incident after two to three months. I will try whatever you instructed me to do if you can walk me through, any troubleshooting. Many thanks!
Below screenshot was taken December last year (2021) when Roon was working flawlessly.
