Azure Site Recovery Compatibility for Debian 12 / 6.1.0-40-cloud-amd64

Question

Azure Site Recovery Compatibility for Debian 12 / 6.1.0-40-cloud-amd64

Jonathan Harris 45

Hi Microsoft,

We have a requirement to setup ASR on a 100 VMs, all running the Debian 12, kernel version - 6.1.0-40-cloud-amd64. When enabling replication the process fails on Installing Mobility Service and preparing target.

The ASR support matrix (link below) does not list this as a compatible OS. Do you have a timeline when this OS will be available in the ASR support matrix?

[https://free.blessedness.top/en-us/azure/site-recovery/azure-to-azure-support-matrix ](https://free.blessedness.top/en-us/azure/site-recovery/azure-to-azure-support-matrix

)

Meanwhile, are you able to provide any intermediary instructions to permit the setup of ASR in this case?

Many thanks,

Bharath Y P 1,350 Reputation points Microsoft External Staff Moderator

2025-09-29T17:39:03.9+00:00

Hello Jonathan Harris,

Yes, Debian 12 with kernel 6.1.0-40-cloud-amd64 is currently not supported by Azure Site Recovery, and replication setup will fail due to Mobility Service incompatibility. ASR relies on the Mobility Service agent to enable replication. This agent must be compatible with the guest OS and kernel. If the OS or kernel is not validated by Microsoft. The agent may fail to install or operate correctly. Target preparation may break due to missing dependencies or unsupported system calls. Currently Microsoft has not announced a timeline for support.
Nick D'Angelo 40 Reputation points

2025-10-14T18:50:05.7733333+00:00

Jonathan, I ran into a similar issue with Debian 12 running 6.1.0-39-amd64. I came across a github repo from Azure for site-recovery. It provides a hotfix that adds new kernels to mobility agent. Check this out and see if it works for you. I got my systems back up and running with this.https://github.com/Azure/Azure-SiteRecovery/blob/main/MobilityAgent/KernelModuleDownloadLinks.md

Answer accepted by question author

0 additional answers

Your answer

Bharath Y P 1,350 Reputation points Microsoft External Staff Moderator

2025-09-29T17:39:03.9+00:00

Hello Jonathan Harris,

Yes, Debian 12 with kernel 6.1.0-40-cloud-amd64 is currently not supported by Azure Site Recovery, and replication setup will fail due to Mobility Service incompatibility. ASR relies on the Mobility Service agent to enable replication. This agent must be compatible with the guest OS and kernel. If the OS or kernel is not validated by Microsoft. The agent may fail to install or operate correctly. Target preparation may break due to missing dependencies or unsupported system calls. Currently Microsoft has not announced a timeline for support.
Nick D'Angelo 40 Reputation points

2025-10-14T18:50:05.7733333+00:00

Jonathan, I ran into a similar issue with Debian 12 running 6.1.0-39-amd64. I came across a github repo from Azure for site-recovery. It provides a hotfix that adds new kernels to mobility agent. Check this out and see if it works for you. I got my systems back up and running with this.https://github.com/Azure/Azure-SiteRecovery/blob/main/MobilityAgent/KernelModuleDownloadLinks.md

Answer 1

Hi ,

Thanks for reaching out to Microsoft Q&A.

Debian 12 with kernel version 6.1.0-40-cloud-amd64 is not currently listed in the ASR support matrix, which is why replication fails at the mobility service installation step. While Microsoft has announced support for Debian 12 in ASR, it does not cover all kernel variants, and no public timeline exists for when this kernel will be validated. In the interim, your only practical options are to switch to a Debian 12 kernel version already in the support matrix, attempt a manual installation of the mobility agent with matching kernel headers and dependencies, or request a hotfix/preview mobility service build through microsoft support. For large scale rollout (100 VMs?), I recommend testing kernel alternatives on a small subset and opening a support case

Please 'Upvote'(Thumbs-up) and 'Accept' as answer if the reply was helpful. This will be benefitting other community members who face the same issue.

Share via

Azure Site Recovery Compatibility for Debian 12 / 6.1.0-40-cloud-amd64

0 additional answers

Your answer