Hi @vigneshvikiis64,
Responded in the thread - Error - astro dev start - #2 by iamakashladdha
It won’t be just limited to Zscaler, but any other Firewall/VPN blocking the connectivity to get the packages installed.
Please check if your system isn’t behind any Firewall or VPN that would be restricting this connectivity.
I hope this helps!
Regards,
Akash