What network security threat does a QM FSM error pose in IPsec VPNs?

What kind of security threat does this pose, and how do I fix it?

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The QM FSM error message appears because the IPsec L2L VPN tunnel does not come up on the PIX firewall or ASA properly.

One possible reason is the proxy identities, such as interesting traffic, Access Control List (ACL) or crypto ACL, do not match on both the ends. Check the configuration on both the devices, and make sure that the crypto ACLs match.