This problem just appeared for me.
No virus software (defender only), I opened the ports, read all of the suggestions, but nothing works and I can not import new datasmith files created with 3ds Max 16.
I updated to 4.19.2 this past week. Until today, everything was working fine. I tried to open datasmith files this morning and it would not open…14 hours later, and the computer was on all night rendering Max files, so I doubt anything was changed on the computer.
“Something went wrong. We were unable to verify your access to the plugin before timing out.”