have yo looked in the vizportal logs yet? this may be a good palce to look. But usually the error code in of itself is enough to know what's going on upon investigation of the code. Also, you can try to manually run the commands via a tool such as Postman which is a google add-on.
Thanks Jeffrey. With help from Tableau support, I was able to find some helpful information here:
+ log-file-location\httpd\access.date-time-stamp.log (for example, access.2015_05_11_00_00_00.log).
+ log-file-location\wgserver\production.port.log (for example, production.8000.log).
do these logs provide any more useful details?