To fix this, add the API endpoint (server IP) and localhost IP to the restriction address allow list.

IMPORTANT: Obtain confirmation from the server security team before implementing these changes. 

 Explicitly allow localhost and the server IP addresses at the site level.

1. Open IIS Manager → Sites → Snow License Manager site.
2. Open IP Address and Domain Restrictions (ensure this feature is enabled in the server configuration).
3. Add Allow Entry for the following:
• 127.0.0.1
• ::1 (IPv6 loopback; include this address because some servers may use IPv6 for local requests)
• Server IP addresses
4. Restart the site (Manage Website → Restart).

Server-level rules can still block requests that are allowed at the site level. Review IIS Manager → [Server name] → IP Address and Domain Restrictions, and verify that localhost, the server IP addresses, and the appropriate administrative subnets are allowed.

Once these settings are applied and validated, local web access and API communication should be restored.