Just FYI.
I updated one of my client PCs and the issue is now gone.
The reason appears to be that Lansweeper changed the DNS for the relay server.
Lsagentlog.txt now shows:
DEBUG Created RelayCommunicationSender to URL https://lsagentrelay.lansweeper.com/EchoService.svc
instead of:
DEBUG Created RelayCommunicationSender to URL https://relay.lansweeper.com/EchoService.svc
it is so odd that the agent has this hardcoded and not configurable from the local server, i.e. configuration on local server --> relay --> agent. This way we could perform a smooth transition.
More concerning is that Lansweeper team did not provide a primary and a secondary DNS OR resolved that with the old DNS (with a redirection).
We will need to schedule a Unscheduled update of 800+ machines now.