I am hitting a server from my local machine. When I increased load I started getting % errors in my aggregate report. Now I am not sure if the errors are because of my local machine failing of because its an actual issue on the server which I am hitting.
I'd advise to check jmeter.log as there can be a lot of problems on running the scenarios on local workstation: insufficient channel bandwidth, to much memory consumption, etc. All they are dumped into jmeter.log file.