QuickBooks Error 12038

QuickBooks Error 12038 is part of QuickBooks' 12000-series errors, and that whole group traces back to one problem: something interrupted the connection to Intuit's servers mid-update. Could be a dropped connection, a blocked port, a timeout. The specific cause varies, but QuickBooks needs a clean handshake to pull down update files, and when that handshake fails, this is the error you get.