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Important note about SSL VPN compatibility for 20.0 MR1 with EoL SFOS versions and UTM9 OS. Learn more in the release notes.
Please check and verify firewall rule and NAT rules flows under MONITOR & ANALYZE || Diagnostics || Packet Capture passing from the same DNAT rules created as above ?.
Make sure the server is reachable with a ping test from the firewall and ports with a telnet test.
Configuration link : https://docs.sophos.com/nsg/sophos-firewall/19.5/Help/en-us/webhelp/onlinehelp/index.html?contextId=rules-policies-NAT-add-assistant
Regards
"Sophos Partner: Networkkings Pvt Ltd".
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