Trying to find the meaning of error codes I find in SSIS logs led me to seek the codes from Microsoft. For example, I had an error code in a log, -1071607685, and when initially searching for error codes I didn’t find anything with that code. So I pulled up the trusty calculator, converted that code to Hex, which ended up looking like FFFFFFFFC020907B. This looked a bit familiar so I started searching for 0xC020907B. This led to eventually finding the Microsoft page, which has both codes.
Here’s the link (until it dies): http://technet.microsoft.com/en-us/library/ms345164.aspx