Site to Site blip but won't reconnect

Graeme Ford 1 Reputation point

I set up some site to site (IPSEC) connections 18 months or so ago. Occasionally I get a blip but, until now they always reconnect. This time however 2 of the 2 connections refuse to reconnect. I have tried everything but can't see what the problem is. At each site we have a Draytek router which connects to the gateway. I have created new connections on the router, I have restarted both ends, I have deleted the LGN and connections and recreated them but still nothing.
Any help would be gratefully appreciated especially as I'm supposed to be on A/L and I've been at this all day.

Azure Virtual Network
Azure Virtual Network
An Azure networking service that is used to provision private networks and optionally to connect to on-premises datacenters.
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  1. msrini-MSFT 9,241 Reputation points Microsoft Employee

    Hi ,

    I can see that the device you are using is not listed among one of the validated devices mentioned in Azure docs (

    My suggestion is to use the validated device to listed in the doc. It doesn't mean that the IPSec will not work on non-validated device. Since it is not validated and it is developed by a different vendor, we need extensive testing and troubleshooting to figure out the root cause.

    I suspect this can be due to the rekey as this issue is not happening when the initial connection is established.

    Karthik Srinivas

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