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https://docs.sophos.com/nsg/sophos-firewall/22.0/Help/en-us/webhelp/onlinehelp/index.html?contextId=remote-access-VPN-IPsec-legacy

IPsec (legacy)

IPsec (legacy) is a retired remote access VPN and isn't supported in SFOS 22.0 MR1 and later.

You can't upgrade to SFOS 22.0 MR1 and later if the firewall contains the legacy remote access IPsec configuration. You must delete the configuration, then upgrade.

You can restore backups and import configurations that contain the legacy remote access IPsec configuration, but this legacy configuration isn't migrated.

Tip

We recommend that you configure remote access connections using one of the following options: