This article provides information about the compatibility of LaCie RAID Manager (v1) and macOS Sierra.
Issue: After updating to macOS Sierra you may experience connectivity issues when launching LaCie RAID Manager (v1). The web browser won't be able to connect to the server, and a message appears informing that web browser
can't open the page "localhost:8845" because it can't connect to the server "localhost". See an example below:
Affected devices:
LaCie 5big Thunderbolt 2
LaCie 8big Rack Thunderbolt 2
Important! If a pop-up blocker is installed, you may need to disable it in order to access the link below.
To resolve the issue, please
uninstall LaCie RAID Manager (v1) and then download and
install LaCie RAID Manager v2 which is compatible with macOS Sierra. It's available to download
here.