We are experiencing recurring issues with our site-to-site VPN tunnel connected to an Azure VPN Gateway. The connection drops intermittently, seemingly related to when the total tunnel ingress reaches around 100GB.
Details
- Frequency: The issue occurs after about 7–9 hours of sustained traffic, typically around 12–14 UTC.
- Data Transfer: The drop is most frequent after transferring ~100GB of data through the tunnel, though it is not consistent—sometimes the tunnel remains active even after surpassing this threshold.
- Connection Status: The Azure portal and local devices always report the connection status as “Connected” even during these drop events.
Setup
- VPN Type: Site-to-site (IPsec)
- Protocol: IKEv2
- SKU: Basic
This issue appears to align with similar reports, such as this discussion:
Azure VPN Gateway drops after transferring large amounts of data – Reddit
Has anyone experienced similar behavior or found a resolution? Any insights into mitigating this would be greatly appreciated.