### Human: Can you tell about Alert - A110026 - Nutanix Cloud Clusters (NC2) - CloudAPIEndpointUnreachable. ### Assistant: This Nutanix article provides the information required for troubleshooting the alert CloudAPIEndpointUnreachable for your NC2 cluster.. Alert Overview

Nutanix Clusters deployed in public clouds are required to make cloud API calls for several operations such as VM IP address assignment validations, VM power-on, VM power-off, etc. These operations may face issues if cloud API calls fail due to underlying cloud infrastructure issues like network connectivity misconfiguration(s), temporary outages, permissions misconfiguration etc. The CloudAPIEndpointUnreachable alert is generated when the backend service detects failure executing cloud API calls due to cloud API endpoint  unreachability.

Sample Alert 

Check ID110026DescriptionConnectivity to Cloud API Endpoint Failed.Impact Networking operations may be impacted on the affected node(s) in the cluster.Alert Title Cloud API Endpoint UnreachableAlert IDA110026Alert Smart Title Cloud API Endpoint may be down or unreachable: {message}Cause #1Cloud API endpoints may be unreachable due to intermittent network connectivity issues in the underlying public cloud.Resolution #1Check if the cloud infrastructure is down due to an outage.Cause #2Missing NAT gateway on Cluster Management subnet.Resolution #2Ensure the route table for the Cluster Management subnet in the cloud contains a default route (0.0.0.0/0) to the NAT gateway. Add the route if not present.Cause #3Cloud subnets may have incorrect route entries in the route tables.Resolution #3Check if the route tables for all cloud subnets contain the appropriate routes from cloud management console.Cause #4IAM role, policy misconfiguration.Resolution #4Ensure IAM roles and policies are configured correctly.Cause #5Security group(s) and/or firewall misconfiguration.Resolution #5From the cloud management console, check if the inbound and outbound rules are correctly configured in the cloud security group(s). Ensure firewall rules do not block access..  Check if the cloud infrastructure si down due to an outage. To get additional details, login to a CVM in the cluster and check the Network Service logs at "/home/nutanix/data/logs/network_service.out" Validate Cloud API endpoints are functional:
	Check cloud components (NAT/Internet GW, Subnet, etc) are not accidentally misconfigured or deleted. Check firewall policies are not misconfiguredCheck route tables contain correct route entries Check network access control list (ACL) and security group are not misconfigured 
	AWS deployments
	Check if the correct IAM role has been assigned to the instance by executing 'curl 169.254.169.254/latest/meta-data/iam/security-credentials; echo' in the CVM. The output should display 'Nutanix-Clusters-High-Nc2-Cluster-Role-Prod'If the role is not attached to the instance, attach it using the steps below:
		Open AWS Mgmt Console and type 'EC2' in the search bar. Select EC2 service. Make sure that the AWS region is the one where the Nutanix Cluster is deployed.In the EC2 search bar, select the filter as VPC-ID. Specify the VPC ID in which the cluster is deployed. The VPC ID can be obtained from the NC2 Console page.Select the required instance from the filtered list of instances. Choose Actions, Security, Modify IAM role. Select the IAM role 'Nutanix-Clusters-High-Nc2-Cluster-Role-Prod' to attach to your instance and choose Save. 
		
	. ### Human: Now explain this as a Nutanix support agent summarizing the answer step by step. In case, you don't know the answer say - I don't know.