VPN with Azure falling down

L2 Linker

VPN with Azure falling down

Hi at all!

I have a problem with a VPN with Azure, after 50 minutes circa the VPN stops working and doesn't restart.

I checked the configuration and everything is right.

This message appears in logs: "IKEv2 child SA negotiation is failed message lacks KE payload".

 

Can you help me to resolve this issue?

 

Regards,

Daniele

L6 Presenter

Re: VPN with Azure falling down

Hi,

 

l had a very interesting experience with Azure VPN. Few things to check check:

 

1) PA has to be in passive mode so only Azure can initiate a VPN

 

2) Suggested config:

 

IKEv2
Diffie-Hellman Group Group 2
Authentication Method SHA1
Encryption Algorithms AES256, 3DES
Phase 1 Security Association (SA) Lifetime (Time) 28,800 seconds

 

CHILD_SA
Encryption Algorithms AES128, 3DES
Authentication Method SHA1
Phase 2 Security Association (SA) Lifetime (Time) 5,400 (Azure side 3,600 seconds)
Perfect Forward Secrecy (PFS) no-pfs

 

3) Disable "Liveness Check"

 

 

More info here:

 

https://live.paloaltonetworks.com/t5/General-Topics/VPN-to-Azure-dropouts/td-p/98936/page/3

 

Thx,

Myky

L2 Linker

Re: VPN with Azure falling down

Hi Myky,

 

Thank for your suggestion, we solved it some days ago checking on Microsoft site (https://docs.microsoft.com/en-us/azure/vpn-gateway/vpn-gateway-about-vpn-devices), we used 'no-pfs' instead of DH group 2 on IPSEC Crypto key.

 

Thank you again!

 

Regards,

Daniele

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