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SSL VPN broken with IPv6 enabled

I recently enabled IPv6 on our Sophos SG210 (HA) firewalls and got bumped, that SSL VPN doesn't connect from inside anymore.

To make sure it wasn't the recent update, I disabled Global IPv6 support and suddenly VPN connects again.

It always works from WAN, but once IPv6 is enabled, it won't connect from internal LAN/VLANs anymore.

It trys to connect to our WAN DNS, which is (yet) IPv4 configured only. External WAN does have IPv6, but it's not yet added to DNS.

How's that connected? Is that a bug?

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