The terraform-provider-azurerm_v4.11.0_x5.exe plugin crashed

[codermrrob]

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Terraform Version

1.9.8

AzureRM Provider Version

4.11.0

Affected Resource(s)/Data Source(s)

azurerm_virtual_network_gateway

Terraform Configuration Files

resource "azurerm_virtual_network_gateway" "gateway1" {
  name                = "${local.business_unit}-${local.app.short_name}-vgw-${local.environment}"
  location            = azurerm_resource_group.integrations.location
  resource_group_name = azurerm_resource_group.integrations.name

  type                = "Vpn"
  vpn_type            = "RouteBased"
  sku                 = "VpnGw1"
  active_active       = false

  ip_configuration {
    name                          = "vgw-ip-cfg-${local.environment}"
    subnet_id                     = azurerm_subnet.vgw_subnet.id
    public_ip_address_id          = azurerm_public_ip.gateway_ip.id
    private_ip_address_allocation = "Dynamic"
  }

  vpn_client_configuration {

    address_space        = ["192.168.100.0/24"]
    vpn_client_protocols = ["OpenVPN"]
    aad_tenant           = "https://login.microsoftonline.com/${local.tenant_id}"
    aad_audience         = local.azure_vpn_gateway_application_id
    aad_issuer           = "https://sts.windows.net/${local.tenant_id}/"
  }
}

Debug Output/Panic Output

Stack trace from the terraform-provider-azurerm_v4.11.0_x5.exe plugin:

panic: interface conversion: interface {} is *schema.Set, not []interface {}

goroutine 141 [running]:
github.com/hashicorp/terraform-provider-azurerm/internal/services/network.expandVirtualNetworkGatewayVpnClientConfig(0xc001daa8f0?, {{0xc001daa8ff, 0x24}, {0xc001daa933, 0x15}, {0xc001daa97c, 0x16}})
        github.com/hashicorp/terraform-provider-azurerm/internal/services/network/virtual_network_gateway_resource.go:1096 +0x1ae5
github.com/hashicorp/terraform-provider-azurerm/internal/services/network.resourceVirtualNetworkGatewayUpdate(0xc002f5a380, {0x791e0e0, 0xc001a15b08})
        github.com/hashicorp/terraform-provider-azurerm/internal/services/network/virtual_network_gateway_resource.go:826 +0x585
github.com/hashicorp/terraform-plugin-sdk/v2/helper/schema.(*Resource).update(0x91e0988?, {0x91e0988?, 0xc003245440?}, 0xd?, {0x791e0e0?, 0xc001a15b08?})
        github.com/hashicorp/terraform-plugin-sdk/v2@v2.35.0/helper/schema/resource.go:828 +0x15f
github.com/hashicorp/terraform-plugin-sdk/v2/helper/schema.(*Resource).Apply(0xc0015ba000, {0x91e0988, 0xc003245440}, 0xc000dbfa00, 0xc002f5a200, {0x791e0e0, 0xc001a15b08})
        github.com/hashicorp/terraform-plugin-sdk/v2@v2.35.0/helper/schema/resource.go:947 +0x83a
github.com/hashicorp/terraform-plugin-sdk/v2/helper/schema.(*GRPCProviderServer).ApplyResourceChange(0xc000c07728, {0x91e0988?, 0xc003245380?}, 0xc00320fa90)
        github.com/hashicorp/terraform-plugin-sdk/v2@v2.35.0/helper/schema/grpc_provider.go:1155 +0xd5c
github.com/hashicorp/terraform-plugin-mux/tf5muxserver.(*muxServer).ApplyResourceChange(0xc0002d8d80, {0x91e0988?, 0xc0032450b0?}, 0xc00320fa90)
        github.com/hashicorp/terraform-plugin-mux@v0.17.0/tf5muxserver/mux_server_ApplyResourceChange.go:36 +0x193
github.com/hashicorp/terraform-plugin-go/tfprotov5/tf5server.(*server).ApplyResourceChange(0xc0003952c0, {0x91e0988?, 0xc0032446f0?}, 0xc001f22f50)
        github.com/hashicorp/terraform-plugin-go@v0.25.0/tfprotov5/tf5server/server.go:865 +0x3d0
github.com/hashicorp/terraform-plugin-go/tfprotov5/internal/tfplugin5._Provider_ApplyResourceChange_Handler({0x86c7300, 0xc0003952c0}, {0x91e0988, 0xc0032446f0}, 0xc002f0b780, 0x0)
        github.com/hashicorp/terraform-plugin-go@v0.25.0/tfprotov5/internal/tfplugin5/tfplugin5_grpc.pb.go:611 +0x1a6
google.golang.org/grpc.(*Server).processUnaryRPC(0xc0001b7400, {0x91e0988, 0xc0030981e0}, {0x920ec80, 0xc001dda000}, 0xc0031a2fc0, 0xc001c59650, 0xe8d4a78, 0x0)
        google.golang.org/grpc@v1.67.1/server.go:1394 +0xe49
google.golang.org/grpc.(*Server).handleStream(0xc0001b7400, {0x920ec80, 0xc001dda000}, 0xc0031a2fc0)
        google.golang.org/grpc@v1.67.1/server.go:1805 +0xe8b
google.golang.org/grpc.(*Server).serveStreams.func2.1()
        google.golang.org/grpc@v1.67.1/server.go:1029 +0x8b
created by google.golang.org/grpc.(*Server).serveStreams.func2 in goroutine 43
        google.golang.org/grpc@v1.67.1/server.go:1040 +0x125

Error: The terraform-provider-azurerm_v4.11.0_x5.exe plugin crashed!

Expected Behaviour

deploy VNG with VPN Client Config

Actual Behaviour

Error: The terraform-provider-azurerm_v4.11.0_x5.exe plugin crashed!

Steps to Reproduce

No response

Important Factoids

azurerm_virtual_network_gateway is deploying fine without the VNG Client block.
same config deploys successfully with azurerm version 3.117.0.
failed in 4.10.0 & 4.11.0

References

No response

[stephybun]

Duplicate of #28097. Closed by #28099.

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