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    500/UDP is the IKE port used by some VPNs. Your NAT gateway may be treating it specially. Try some other public port, preferably something above 1024.
    – Spiff
    Commented Sep 16, 2023 at 23:19
  • @Spiff Thanks, I tried port 1075 but no change Commented Sep 16, 2023 at 23:56