PowerShell Command to export NSG rules in Azure.

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Connect to Azure using the command below and authenticate with valid credentials.

Connect-AzAccount

After establishing Azure connectivity, execute the command below to export the NSG rule.

$nsgName = "NSG name"
$resourceGroupName = "resource group name"

# Retrieve NSG rules and flatten the lists for Source and Destination prefixes
(Get-AzNetworkSecurityGroup -Name $nsgName -ResourceGroupName $resourceGroupName).SecurityRules | 
Select-Object Name, Direction, Priority, Access, 
    @{Name='SourceAddressPrefix';Expression={[string]::Join(',', $_.SourceAddressPrefix)}}, 
    @{Name='SourcePortRange';Expression={[string]::Join(',', $_.SourcePortRange)}}, 
    @{Name='DestinationAddressPrefix';Expression={[string]::Join(',', $_.DestinationAddressPrefix)}}, 
    @{Name='DestinationPortRange';Expression={[string]::Join(',', $_.DestinationPortRange)}}, 
    Protocol |
Export-Csv -Path "C:\nsg_rule.csv" -NoTypeInformation

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