ASA and Fortigate-300 VPN

Trying to troubleshoot an ipsec tunnel between an ASA5510 running

706-k8.bin and a fortigate-300 (not sure what version OS)

Since the connectivity has been intermittent and we have little knowledge of changes on, let alone access to, the fortigate, I'm just curious to know if anyone has encountered any incompatibilities or mysterious intermittent connectivity, in this scenario. Connectivity goes away even if tunnel appears to be up on both sides.

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