Tried with Xitrum new project fresh downloaded on Win 10 and Debian:
Got:
[INFO] HTTP server started on port 8000
[INFO] HTTPS server started on port 4430
[INFO] Xitrum 3.28.15 started in development mode
[WARN] *** For security, change secureKey in config/xitrum.conf to your own! ***
[INFO] 0:0:0:0:0:0:0:1 GET / -> quickstart.action.SiteIndex -> 200, 22831 [ms]
[INFO] 0:0:0:0:0:0:0:1 GET /webjars/xitrum/3.28.15/xitrum.css?WeZg0rcDACGbqN_6cAf2jw -> 200 (JAR resource)
[INFO] 0:0:0:0:0:0:0:1 GET /webjars/bootstrap-css/3.3.6/css/bootstrap.css?W6N62RY2Q8MiUTZnVPCLKg -> 200 (JAR resource)
[INFO] 0:0:0:0:0:0:0:1 GET /app.css?7770790184219633591 -> quickstart.action.NotFoundError, queryParams: {7770790184219633591: } -> 404, 2445 [ms]
[INFO] 0:0:0:0:0:0:0:1 GET /favicon.ico?6018502014319075043 -> quickstart.action.NotFoundError, queryParams: {6018502014319075043: } -> 404, 142 [ms]
[INFO] 0:0:0:0:0:0:0:1 GET /whale.png?-6887168387166668424 -> quickstart.action.NotFoundError, queryParams: {-688716838716666...: } -> 404, 207 [ms]
[INFO] 0:0:0:0:0:0:0:1 GET /robots.txt -> quickstart.action.NotFoundError -> 404, 528 [ms]
on both machines.