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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.
Hello Levi,
Did you try using a different browser such as Chrome or Firefox? It seems like a browser-related issue.
In any case, you could also try upgrading to 17.5.15 or 18 MR4 if the issue persists.
Regards,