
I've tried with the Windows 10 machine both joined to the domain and in its own workgroup, as well as trying with and without the "Use Windows session authentication" option.
I can telnet to the server on port 9392 and get a response, so it's not a firewall issue. The server does have AV installed but I have tried removing it with the same result. Anything I've found online about the particular error is mostly talking about RDP authentication issues with a particular Windows update from a year ago, but this doesn't seem to be relevant - RDP between the two machines working fine. I can open shared folders between the two machines, all other services requiring authentication seem to be working normally.
I've installed the B&R Console on another server (2019 Std) and get the same result from there, so the issue would seemingly be something on the B&R server.
Same result if I try and connect via Powershell using Connect-VBRServer -Server "servername".
Have checked the event logs on both the client and the server and can't see anything untoward at all.
Has anybody seen this before?