According to the image description, the update source for LCM is configured to use the Nutanix Portal URL, which is a web address that requires internet access.The LCM inventory operation needs to download the latest manifest file and module files from the Nutanix Portal URL using port 801. If port 80 is blocked by a firewall, the LCM inventory will fail with an error message such as "Failed to get size of file at5" or "The requested URL returned error: 403 Forbidden" as shown in the web search results23.To resolve this issue, the firewall rules need to be updated to allow port 80 traffic from the CVMs to the Nutanix Portal URL1.
References:1:LCM Requirements - Nutanix Support & Insights2:LCM Operation failed. Reason: Inventory setup failed. - Mastering Nutanix3:LCM: Perform Inventory Fails with error: Pre-check test_cluster_status failed - Nutanix Support & Insights