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Copy file name to clipboardExpand all lines: AKS-Arc/network-validation-errors.md
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# Troubleshoot network validation errors
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This article provides guidance on identifying and resolving various network validation errors encountered during cluster creation, emphasizing the importance of pre-checks for early issue detection. These errors are detected by pre-checks designed to highlight issues early, allowing for easier resolution before the cluster is created.
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This article describes how to identify and resolve various network validation errors encountered during cluster creation, emphasizing the importance of pre-checks for early issue detection. These errors are detected by pre-checks designed to highlight issues early, allowing for easier resolution before the cluster is created.
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The article summarizes the error codes, possible causes of the errors, and mitigation steps.
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The article summarizes error codes, their potential causes, and actionable mitigation steps to help you resolve issues effectively.
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## CloudAgentConnectivityError
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Logical network IP addresses can't connect to management IP pool addresses, due to:
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- Incorrect DNS server resolution.
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- Firewall rules between the Arc VM logical network and the cloud agent endpoint.<br/>
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- Firewall rules between the Arc VM logical network and the cloud agent endpoint.
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- The logical network is in a different VLAN than the management IP pool and there's no cross-VLAN connectivity.
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### Mitigation
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To resolve this error, you can take the following steps:
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- Make sure that the DNS servers specified in the Arc VM logical network can resolve the MOC cloud agent FQDN.
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- Make sure that the logical network IP addresses can connect to all the management IP pool addresses on the required ports. See the [AKS network port and crossVLAN requirements](aks-hci-network-system-requirements.md#network-port-and-cross-vlan-requirements) for a detailed list of ports that need to be opened.
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- Make sure that the logical network IP addresses can connect to all the management IP pool addresses on the required ports. For a detailed list of ports that need to be opened, see [AKS network port and cross-VLAN requirements](aks-hci-network-system-requirements.md#network-port-and-cross-vlan-requirements).
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## InternetConnectivityError
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To resolve this error, you can take the following steps:
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- Make sure that the management IP pool addresses can reach the logical network IP addresses.
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-Check the [AKS network port and crossVLAN requirements](aks-hci-network-system-requirements.md#network-port-and-cross-vlan-requirements) for a detailed list of ports that need to be opened.
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-For a detailed list of ports that need to be opened, see [AKS network port and cross-VLAN requirements](aks-hci-network-system-requirements.md#network-port-and-cross-vlan-requirements).
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## DNSResolutionError
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## Contact Microsoft Support
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If the problems persist, [collect AKS cluster logs](get-on-demand-logs.md) before you [create a support request](aks-troubleshoot.md#open-a-support-request).
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If problems persist, [collect AKS cluster logs](get-on-demand-logs.md) before you [create a support request](aks-troubleshoot.md#open-a-support-request).
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