API Management Service: Unable to update due to service outage — Troubleshooting VNet injection failures

maxk-6580 5 Reputation points
2026-08-22T23:03:32.6366667+00:00

Problem description

I am experiencing issues updating my Azure API Management (APIM) service, specifically with Virtual Network (VNet) injection. The update fails during the process, returning an error indicating that the service cannot be updated with VNet injection at this time. I need assistance understanding the cause and how to resolve this issue.

Environment

Azure API Management Service in Canada East region, on the Premium tier, deployed in multiple regions including Italy North and Canada East.

What I've already tried

I completed a network comparison between a successful deployment (bhm07) and the failed one (bhm08-bhm10). I verified that the network configurations, including DNS and routing, are identical across the subnets. I also retried the update sequentially for bhm08-query, reproducing the failure, and preserved the failed state for further analysis.

Current status

I am seeking guidance on diagnosing the root cause of the update failure, specifically related to outbound connectivity or network configuration issues, and instructions on how to proceed to resolve the VNet injection problem.

Azure API Management
Azure API Management

An Azure service that provides a hybrid, multi-cloud management platform for APIs.


2 answers

Sort by: Most helpful
  1. Max Kryatov 0 Reputation points Microsoft Employee
    2026-08-25T23:09:43.4+00:00

    Thank you, Mohammad! This explains random nature of HTTP 400 however APIM team needs to take further action to increase compute quota. There is no action on customer side.

    Was this answer helpful?

    1 person found this answer helpful.
    0 comments No comments

  2. SHOUMIK CHAKRAVARTY 80 Reputation points
    2026-08-23T17:22:09.3333333+00:00

    Hello @maxk-6580 - Since both details and innerError are null, the error doesn't point to a specific requirement — so the multi-region checks matter more than subnet comparison.

    One thing a subnet comparison won't surface is regional service tags. From the VNet configuration reference: "In multi-region deployments, the NSG in each region should allow traffic to the service tags for that region and the primary region."

    So Italy North needs Storage.ItalyNorth, Sql.ItalyNorth, and EventHub.ItalyNorth as well as the Canada East equivalents. If those subnets inherited only the primary region's NSG rules, they'd be missing their own regional tags, which matches the failure on …-prd-itn. This point doesn't apply if you're using the global Storage / Sql / EventHub tags, since those already cover all regions.

    Scope note: that reference covers the classic tiers. If these are Premium v2 instances, injection requirements are documented separately.

    Also worth checking in multi-region Premium: AzureTrafficManager inbound on 443 (required for external VNet mode) and AzureLoadBalancer inbound on 6390 (Developer SKU is exempt; missing it at Premium blocks control-plane and data-plane access).

    Help make this community better for everyone: if this answer resolved your issue, please accept it or leave an upvote. If not, share more details in a comment so we can continue the discussion and find the right solution.

    Was this answer helpful?


Your answer

Answers can be marked as 'Accepted' by the question author and 'Recommended' by moderators, which helps users know the answer solved the author's problem.