I have the same problem here, there is an error message, when I try to connect to my DOMA.

"The underlying connection was closed: An unexpected error occurred on a send."

I think this is somehow related to the deprication of the TLS 1.0 and TLS 1.1 protocols and that QuickRoute is built with an old .NET framework version, that does not support TLS 1.2

I also have the same problem as you. And get the same error message. It is clear that there is something local on the PC that stops the communication with the server and that it is a feature of Quickroute that should be changed. But it looks like the developer is not doing anything about it. I think that then it should be stated on the website that the program only works on older versions of equipment / operating system so that we who have newer versions do not spend a lot of time on something we think will work. It would be best if we got an upgrade of the program so that it works.