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Azure IPSec VPN Site-to-Site does not connect all the subnets

Karnov

I am in the process of building an Azure environment and using an Azure Site-to-Site IPSec VPN.  I followed the instructions and got the VPN up and running and find quite often when I teardown the VPN connection and restore the VPN connection, not all the subnets will connect all the time.  Usually it's only the default VLAN that will connect and all the other local subnets will stay disconnected.  For whatever reason, sometimes all the subnets will connect.  Very inconsistent.

I understand I'm supposed to activate the VPN, but not to connect the VPN since the Azure VPN must initiate the connection (VPN is set to respond only).  However, occasionally if I manually connect the VPN, all the local subnets will connect.  Not always.  

Any idea what the issue is?  This is very concerning if I can't have a reliable Azure site to site VPN.



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