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IPSEC Tunnel randomly fails

Hi everyone,

I setup last week a VPN Tunnel beetween Cisco ASA 5585 cluster (Responder) and 4 Netasq U30 (Initiator). Users behind have to connect to a RDS server behind the Cisco Cluster.

Here's what I have in the monitor view, Cisco Side :

- IP = <Netasq_U30_IP>, Received encrypted Packet with no matching SA, Dropping

And here's what I have in the monitor view, Netasq Side :

- IPSEC phase 2 failed.

The only way I found to fix the problem is to generate trafic from the server (cisco side) to the clients (netasq side).

Then, I can see the Phase 1 and phase 2 process to initiate the new tunnel.

I checked the configuration, especially the phase 2, but everything seems to be strictly equal :

- Remote Networks

- Phase 2 lengt

- IPSEC proposal

- PFS DH Group

All the Netasq encounter the issue, randomly and not simultaneously.

I hope someone will have an advice for me

Thanks in advance.

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