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Event ID: 4285 Source: IPSec

Failed to authenticate the hash for <number> packet(s) received from <ip>. This could be a temporary glitch; if it persists please stop and restart the IPSec Policy Agent service on this machine.
As per Microsoft: "Although the event text suggests that a restart of the IPsec service may fix the problem, the source of most packet loss problems is not the IPsec system. Restarting the service will not fix the problem and may cause more problems. The IPsec service should be stopped only as a last resort to identify whether a problem is IPsec-related or not". See the link to "Troubleshooting IPsec" for more information on this issue.

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