Hi all,
When installing Sisense (Linux version) on proxy environments, the sisense.sh script uses a command to check if some sites are reacheable from the server. It's the nc command (at least at Red Hat deployments). This command does not work on proxy environments, so you are going to get errors in preinstall checks, although the sites are reachable (for example, quai.io). In order to proceed to install, you should edit the sisense.sh script and commment all the nc sections that makes the check that this sistes are available to perform the install.
Hope it helps and this issue will be solved in next releases.
BR
