A security technician is trying to connect a remote site to the central office over a site-to-site VPN. The technician has verified the source and destination IP addresses are correct, but the technician is unable to get the remote site to connect. The following error message keeps repeating:
"An error has occurred during Phase 1 handshake. Deleting keys and retrying..."
Which of the following is most likely the reason the connection is failing?
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