That network issue seems related to HTTP/2 option. In the check virtual user panel, hit the advanced button, hit the button with 3 dot next to the browser list and uncheck HTTP/2 option.
To do the same for a test, it's under the population settings.
Regarding the collaboration part, if you have your own SVN server you need to check with your IT regarding the connection settings.
I checked with other application as well, but get similar error each time.
Crux is I am not able to execute a test.
Please see attached document for error description and log..
Also, Can you tell me what details do i need to fill in Edit> Preferences> Collaboration..
Check Attachment for reference.