ValueError: Expecting property name: line 2 column 1 (char 2)
This behavior will occur if due to an issue in the file noted above: "Error importing legacy filters from file /etc/cb/ingressfilter.conf". When previous versions were generally accepting of ingress filter file problems, 6.X will fail on parsing if there are issues in this file
Review the ingress filter file (/etc/cb/ingressfilter.conf in the example above) for format issues (extra commas, missing lines, etc). If no issue can be found, you may upload the file to CarbonBlack alliance and request assistance via a new support ticket and mention this KB article and the exact error message encountered.