Stratodesk is not listed on supported Linux system as stated here:
https://sc1.checkpoint.com/documents/SSL_Network_Extender_AdminGuide/Content/Topics-SNX-Admin-Guide/...
They use their own Linux distro so it is not ''based'' on something else. Keep this in mind.
Second
Are you sure that the SNX software also got updated on the Linux server itself?
On GW check: cat $CVPNDIR/htdocs/SNX/CSHELL/snx_ver.txt
On client check: snx -h
It should be 80008407
Third, you could use this SK to debug client and or GW:
https://support.checkpoint.com/results/sk/sk33833
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