topic Re: IPSec VPN not working before phase 2 negotiation in General Topics

IPSec VPN not working before phase 2 negotiation

yhlee1 — Mon, 24 Dec 2018 07:38:31 GMT

Hello,

I made an VPN Tunnel between paloalto and fortigate(3 tunnels).

Every config is same between them. 2 of them work well but 1 tunnel has an issue.

About 3 mins before phase 2 negotiation(by lifetime or other reason), traffics can't go through the tunnel.

(I can see traffic logs that incomplete).

After negotiation and install sa, it works normally.

What should I look? There no error log or fail in ikemgr or system log.

Re: IPSec VPN not working before phase 2 negotiation

Raido_Rattameister — Mon, 24 Dec 2018 16:00:42 GMT

Check renegotiation time. Does it match with peer site?

Re: IPSec VPN not working before phase 2 negotiation

yhlee1 — Mon, 24 Dec 2018 16:02:55 GMT

Yes
I checked again and it’s same both ends

Re: IPSec VPN not working before phase 2 negotiation

Raido_Rattameister — Mon, 24 Dec 2018 16:11:14 GMT

When traffic does not pass any more from one side to other then try to initiate traffic from other side back to your side. Does traffic flow then?

Re: IPSec VPN not working before phase 2 negotiation

yhlee1 — Mon, 24 Dec 2018 16:16:27 GMT

I think it will work
After phase 2 negotiation ends, it works
It worked when I disable/enabled tunnel.
Issue happens occasionally, 2 or 3 times a day, so I need to remove the cause..

Re: IPSec VPN not working before phase 2 negotiation

Raido_Rattameister — Mon, 24 Dec 2018 17:02:27 GMT

I would check tunnel status at other side when it happens.

Re: IPSec VPN not working before phase 2 negotiation

yhlee1 — Wed, 26 Dec 2018 07:44:32 GMT

Thanks,

I want to check it but I don't manage that device... So it's hard to check other side.

Re: IPSec VPN not working before phase 2 negotiation

SShnap — Wed, 26 Dec 2018 20:17:38 GMT

Hi @yhlee1

I have the same issue with old and stable ipsec tunnel between PA3020 (8.1.1) and VM200 (8.0.10).

suddenly the tunnel is not working even when the connection looks fine and system logs show tunnel is up.

on source side I see traffic go to tunnel and aged-out, on destination side logs don't show the traffic.

when I change something on the tunnel config and revert the changes or disable/enable the tunnel it come back to normal.