Hi @vigneshvikiis64,
Welcome to the Astro Community, Glad to see you using the Astro CLI.
Per the error message (NewConnectionError) provided It looks like a connection cannot be established from your terminal to download and install the required packages.
WARNING: Retrying (Retry (total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError ('<pip. vendor.urllib3.connection.HTTPSConnection object at Ox7f2efaf5dc70>: Failed to establish a new connection: [Errno -2] Name or service not known) ': / simple/astronomer-fab-security-manager/
Please check your network connectivity and see if your system isn’t behind any Firewall or VPN that would be restricting this connectivity.
I hope this helps!