Hello @cde1 thank you for getting in touch with us and sorry to hear you have encountered this error message.
I will move your post to our Siege forum as you are currently posting in our Extraction forums.
This error message is usually caused by anti-virus software or Windows Firewall settings.
Can you ensure that Siege and Ubisoft Connect are marked as a trusted programs in any software you may be using and also ensure that Ubi Connect is running with admin rights >> https://www.ubisoft.com/en-gb/help/article/000060505
You can check your Windows Defender Firewall settings by opening your Windows Settings > Search for 'Windows Defender Firewall' > Select 'Allow an app or feature through Windows Defender Firewall' > 'Allow another app' > Add the game, the launcher, and any of its supported software it may use such as BattlEye or FairFight, to your apps that are allowed to connect online