I have what appears to be the same problem when trying to connect to any of 4 Windows 10 computers. I can connect very quickly and reliably to all 4 host computers using Viewer 7.17 from my Windows 10 computer and also from the RU app on my Android phone, no problems at all. However, when I try to connect via the latest RU app on my iPad 4 running iOS 15.7, I get EXACTLY the same results described by Chris Ward.