Azure Virtual Network
An Azure networking service that is used to provision private networks and optionally to connect to on-premises datacenters.
Network Manager ipam pool API throttling
Michał Smereczyński
20
Reputation points MVP
When performing CreateOrUpdate on vNet in parallel (more than around 2 at the same time) I'm receiving an error that suggest throttling on IPAM API. I'm using resources allocation during the vnets deployment. The deployment is failing if vnet creation is not serialized. It's not a problem when deployment in loop need to be changed to serial, but it is starting to be a problem in organization where high number of deployments are using the same pool.
unexpected status 400 (400 Bad Request) with error: IpamApiCallFailed: Ipam API call failed with status PreconditionFailed with error message Precondition failed. Please retry the operation after some time., please check the parameters and retry.
Can someone from Networking Product Group comment on this throttling? Is it expected? If yes, then why not documented (or I'm missing something)?
Azure Virtual Network
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Ganesh Patapati 9,005 Reputation points Microsoft External Staff Moderator2025-08-26T10:31:14.8166667+00:00 Hello Michał Smereczyński
for further troubleshooting can you please share the following details in the private messages,
- can you please share me the Vnet and IPAM details.
- Can you please share me the exact error messages along with the timestamp. You can get this information from activity log.
It's important to note that while throttling is a common practice in APIs to maintain service quality, exact thresholds are often not documented. This might explain why you're not finding specific guidance for the IPAM API throttling.
Refer: Troubleshooting API throttling errors
I hope this was helpful!
If the above is unclear or you are unsure about something, please add a comment below.
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Michał Smereczyński 20 Reputation points MVP
2025-08-26T11:11:03.3366667+00:00 Hi @Ganesh Patapati
IPAM: /subscriptions/d8207ac4-c426-49b0-8395-3f197ed7a82e/resourceGroups/rg-maugp-poc-plc/providers/Microsoft.Network/networkManagers/netman-maugp-poc-plc/ipamPools/pool1I just ran fresh deployment that failed.
Error:{"status":"Failed","error":{"code":"DeploymentFailed","target":"/subscriptions/e2dda714-1e15-49ca-961c-377a63fb5769/providers/Microsoft.Resources/deployments/main","message":"At least one resource deployment operation failed. Please list deployment operations for details. Please see https://aka.ms/arm-deployment-operations for usage details.","details":[{"code":"ResourceDeploymentFailure","target":"/subscriptions/e2dda714-1e15-49ca-961c-377a63fb5769/resourceGroups/rg-maugp-poc-9-plc/providers/Microsoft.Resources/deployments/vnet-9-deploy","message":"The resource write operation failed to complete successfully, because it reached terminal provisioning state 'Failed'.","details":[{"code":"DeploymentFailed","target":"/subscriptions/e2dda714-1e15-49ca-961c-377a63fb5769/resourceGroups/rg-maugp-poc-9-plc/providers/Microsoft.Resources/deployments/vnet-9-deploy","message":"At least one resource deployment operation failed. Please list deployment operations for details. Please see https://aka.ms/arm-deployment-operations for usage details.","details":[{"code":"IpamApiCallFailed","message":"Ipam API call failed with status PreconditionFailed with error message Precondition failed. Please retry the operation after some time., please check the parameters and retry.","details":[]}]}]},{"code":"ResourceDeploymentFailure","target":"/subscriptions/e2dda714-1e15-49ca-961c-377a63fb5769/resourceGroups/rg-maugp-poc-1-plc/providers/Microsoft.Resources/deployments/vnet-1-deploy","message":"The resource write operation failed to complete successfully, because it reached terminal provisioning state 'Failed'.","details":[{"code":"DeploymentFailed","target":"/subscriptions/e2dda714-1e15-49ca-961c-377a63fb5769/resourceGroups/rg-maugp-poc-1-plc/providers/Microsoft.Resources/deployments/vnet-1-deploy","message":"At least one resource deployment operation failed. Please list deployment operations for details. Please see https://aka.ms/arm-deployment-operations for usage details.","details":[{"code":"IpamApiCallFailed","message":"Ipam API call failed with status PreconditionFailed with error message Precondition failed. Please retry the operation after some time., please check the parameters and retry.","details":[]}]}]}]}}Raw error from one of the RGs:
{ "code": "DeploymentFailed", "target": "/subscriptions/e2dda714-1e15-49ca-961c-377a63fb5769/resourceGroups/rg-maugp-poc-9-plc/providers/Microsoft.Resources/deployments/vnet-9-deploy", "message": "At least one resource deployment operation failed. Please list deployment operations for details. Please see https://aka.ms/arm-deployment-operations for usage details.", "details": [ { "code": "IpamApiCallFailed", "message": "Ipam API call failed with status PreconditionFailed with error message Precondition failed. Please retry the operation after some time., please check the parameters and retry." } ] }Tracking ID: c91dd8dc-ffa9-4e63-a0ab-8c2c77dac461
Timestamp: 8/26/2025, 12:58:18 PMOperation ID: /subscriptions/e2dda714-1e15-49ca-961c-377a63fb5769/resourceGroups/rg-maugp-poc-9-plc/providers/Microsoft.Resources/deployments/vnet-9-deploy/operations/0591E743E373B21A
I will not delete the deployment for some time - until you confirm that you have what you need or in let say two days. I believe we will be in touch ;)
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Ganesh Patapati 9,005 Reputation points Microsoft External Staff Moderator
2025-08-26T12:36:58.5066667+00:00 Hello Michał Smereczyński
Thanks for the reply!
I have Initiated a private message with you. Kindly provide the necessary details in the private chat.
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