Hi Novae,
sorry for my late answer, but i did forgot about your issue
I did open
an issue concerning your error at the time you have submitted your log.
Since 10 days it still doesn't get any attention yet...
1) You could try to unselect "HTTP Engine V2" from the "General Configuration" tab. That's said i don't think that will help in your case as the HTTP header seem null.
2) Try to add this line into your
Samsung-CD.conf configuration file:
3) Add this line into your
UMS.conf file inside your profile folder: (not the one inside your program folder)
And please, restart UMS if it was running and report back with a new log for each test. Thank you for your understanding.
EDIT:
4) I suspect Chromecast to make problem, but if you still get this issue, try to add this into the line "Use an IP filter..." in your "General Configuration" tab from the GUI:
5) And as the last try, click on "Select renderers" in the "General Configuration" tab from the GUI ans unselect all the renderers except your Samsung.
And don't forget to restart UMS after each changes.
After that, i feel short of bullet for now. @Nadahar is certainly the most network aware here, so perhaps he could go further on that.