Network Manager IPAM - "failed to fetch usage data" error and cannot remove

Jon Pratt 0

I have a Network Manager in my subscription, that is showing a 'failed to fetch usage data' error in the Azure portal. Have had this error before on support case 2502060xxxxxxx and it was fixed at the backend after a time.

What happens is, get this error in the portal

and this error via the API

What I deployed was

Network Manager

Top Level IPAM pool

2 sub pools - One of which had a vnet deployed into it

1 vnet with a IPAM allocation to the pool called 'internal platform'

And the problem I think is related to the fact that

These resources are deployed using the Terraform AZAPI provider, which can often have problem with related resources timing or race condition issues.

When I destroyed the resources with Terraform - as there is no explict dependancies between the azapi resoruces, things have been deleted out of order, incorrectly.

I now have a vnet I cant delete as it thinks its is linked to the IPAM pool that is having a issue

and I can't delete the IPAM pool as it thinks there is associated resources (the vnet I guess) but does not show as you can see here User's image

but when I try to delete in the portal - complains about associated resources

How can I get help from the MS team to fix this problem?

Rohith Vinnakota 3,150 Reputation points Microsoft External Staff

2025-03-11T18:08:42.1133333+00:00

Hi @Jon Pratt

From the screenshots, I could see that IPAM pool has no associated resources, but VNET deletion still fails because it thinks there are dependencies. Sometimes, resources get stuck in a state where the portal doesn't reflect their actual dependencies.

You can try to delete using Azure CLI or PowerShell commands that may help on force deletion of the resources.

For example:-

VNet Deletion

az network vnet delete --name <VNetName> --resource-group <ResourceGroup> --yes

If the VNet is blocking, please try to remove the IPAM allocation first:

az network vnet update --name <VNetName> --resource-group <ResourceGroup> --remove ipAllocations

Then delete the IPAM pool

az network ipam pool delete --name <IPAMPool> --resource-group <ResourceGroup>

Refer this doc: az network vnet | Microsoft Learn

You can also check for any hidden dependencies using Azure Resource Graph Queries

Kindly let us know if the above helps or you need further assistance on this issue.
Jon Pratt 0 Reputation points

2025-03-12T10:49:09+00:00

Hi Rohith, thanks for getting back to me.

So I knew that IPAM was blocking the VNET delete as I had attempted it before in the Portal. But I used your helpful guide, az cli gives the following responses / problems :(

az network vnet update --name vnet-et-core-hub-uks --resource-group rg-et-core-hub-uks-network --remove ipAllocations

(VnetCannotGetUpdatedWhenDeletionWasAttemptedEarlier) Virtual Network vnet-et-core-hub-uks can not be updated when deletion was attempted earlier.

Code: VnetCannotGetUpdatedWhenDeletionWasAttemptedEarlier

Message: Virtual Network vnet-et-core-hub-uks can not be updated when deletion was attempted earlier.

and if I try to delete the network directly -

az network vnet delete --name vnet-et-core-hub-uks --resource-group rg-et-core-hub-uks-network

(IpamApiCallFailed) Ipam API call failed with status NotFound with error message Pool with ARM ID '/subscriptions/066735d2-472c-4e82-9699-d5c5fa726d17/resourceGroups/rg-et-core-hub-uks-network/providers/Microsoft.Network/networkManagers/netmgr-et-core-hub-uks/ipamPools/InternalPlatform' cannot be found, please check the parameters and retry.

Code: IpamApiCallFailed

Message: Ipam API call failed with status NotFound with error message Pool with ARM ID '/subscriptions/066735d2-472c-4e82-9699-d5c5fa726d17/resourceGroups/rg-et-core-hub-uks-network/providers/Microsoft.Network/networkManagers/netmgr-et-core-hub-uks/ipamPools/InternalPlatform' cannot be found, please check the parameters and retry.

I guess the problem to try to fix now is related to VnetCannotGetUpdatedWhenDeletionWasAttemptedEarlier error

Is there anyway to change the backend state on the VNET to rol back the (failed) delete status, then update (remove IPAM) and then delete again (sucessfully)
Jon Pratt 0 Reputation points

2025-03-12T11:05:38.51+00:00

you can see the Network Manager thinks it has a pool with a child pool ... but they never show the IP count (due to the fetch data error)

and the 'internalpool' that is supposed to have a allocation is it - is not showing anything - note the issues in the red boxes

before the Engineer logged a case with the produuct group - and I have reached out to him already, but he is unable to help me as there is no Ticket ID like before, just this Q&A service.

Is there any chance you can raise a proper internal service request for me so the Product team can do the fix? I know this is a preview service so expect bugs - but I have foudn this one twice now and first time it was fixed, this time we need a proper ticket and then it can be fixed again :)
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