Thank you for posting your query on Microsoft Q&A, from above description I could understand that you are getting error: "The connection to the data plane failed. Please refresh and try again", while trying to access Key Vault from admin portal (Azure).
Please do correct me if this is not the case by responding in the comments section:
This error could occur when under the following conditions:
- A firewall rule that is blocking traffic to the Azure Key Vault.
- A DNS issue that is preventing your client from resolving the name of the Azure Key Vault.
- A connectivity issue between your client and the Azure Key Vault.
To validate private link connection:
Create a virtual machine by following the steps in Create a Windows virtual machine in the Azure portal
In the "Networking" tab:
- Specify Virtual network and Subnet. You can create a new virtual network or select an existing one. If selecting an existing one, make sure the region matches.
- Specify a Public IP resource.
- In the "NIC network security group", select "None".
- In the "Load balancing", select "No".
Open the command line and run the following command:
- If you run the ns lookup command to resolve the IP address of a key vault over a public endpoint, you'll see a result that looks like this:
c:\ >nslookup <your-key-vault-name>.vault.azure.net Non-authoritative answer: Name: Address: (public IP address) Aliases: <your-key-vault-name>.vault.azure.net
- If you run the ns lookup command to resolve the IP address of a key vault over a private endpoint, you'll see a result that looks like this:
c:\ >nslookup your_vault_name.vault.azure.net Non-authoritative answer: Name: Address: 10.1.0.5 (private IP address) Aliases: <your-key-vault-name>.vault.azure.net <your-key-vault-name>.privatelink.vaultcore.azure.net
If you are getting public IP then its an issue with the private endpoint configuration, however if you get private endpoint, then you need to follow the Troubleshooting Guide
- If your Private Link is correctly configured or if you aren't using a Private Link
- If you aren't experiencing any connectivity issues
This error message can also be caused by a
Tenant Mismatch- if you recently deployed your Key Vault to a subscription that contains a different Tenant ID, or the subscription that owned the KV was moved to a different Tenant. For more info - The connection to Data Plane Failed. In order to resolve a potential Tenant Mismatch issue, you can update your Key Vault's Tenant ID. For more info - Moving an Azure Key Vault to another subscription.
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