XFileSharing Pro - Please help: Free user get "Link Expired" (w/nginx

[panda]

Immediately after clicking download button to get the file, free user get "Link Expired".

(Not because he turns to download such link later for hours, but it happens at first.)

Note: we are using Nginx.

[admin]

If you're running several file servers - make sure to sync time on all servers (including main).