Data Uploader - '('Cannot connect to proxy.', error('Tunnel connection failed: 403 Forbidden',))'

[anyioneta]

Splunk 7.1 is installed on a VM running Linux

I am using the Splunkweb Data Loader to upload files from my desktop.

I receive the following error for any file type (except zips) when using the Splunkweb Data Loader

Non-zip files show progress bar until 100% is reached and then display the error message above.

[xpac]

Taken from this answer by @dgrubb:

What happens if you try and set this
in splunk-launch.conf

no_proxy=127.0.0.1,localhost