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HTTP and Telnet on WAN management
Allowing unencrypted administration (HTTP or Telnet) on WAN-facing interfaces exposes credentials and session traffic. Restrict management to HTTPS/SSH, trusted hosts, and a dedicated management interface where possible.
Fortinet documents this class of control in FortiOS administration and hardening guidance.
Weak Diffie-Hellman groups in IPsec phase 1
DH groups 1, 2, and 5 are considered weak for modern IPsec. Prefer group 14 or stronger (or the equivalent your FortiOS release supports) and disable obsolete proposals on production tunnels.
Confirm supported groups for your FortiOS version before changing production VPNs.