A working s2s vpn tunnell stopped working with the error Max number of established MM SAs to peer exceeded. What is causing this and how to resolve

Question

A working s2s vpn tunnell stopped working with the error Max number of established MM SAs to peer exceeded.

The tunnel has been up continuously since Feb 2023 - NO changes were made on the AZURE VPN gateway, neither any changes in the on premise gateway.

Help Please

Answer 1

Hi Rao Atluri,

Welcome to the Microsoft Q&A and thank you for posting your questions here.

Could you please try this troubleshoot steps to resolve the issue

• Reset the connection.https://learn.microsoft.com/en-us/azure/vpn-gateway/reset-gateway#connection-reset
• check the check the IKE logs on on-prem device.
• Most of the cases gateway will not respond on this scenario need to check with your on-prem VPN device.

Kindly let us know if the above helps or you need further assistance on this issue.

Thanks,
Rohith