The testing completed but failed.

Some tests on my private instance not completed properly.
I see in file with results only this data:

In web interface:
What may be the reason?
2 months ago everything worked perfectly.

Looks like solution:
“The test completed but there were no successful results
If you’re using a 64-bit Windows client you will be unable to perform traffic shaping (using dummynet.) In your locations.ini, add connectivity=LAN to the test location.”

did not help =(