Data sent from local computer to local computer (localhost) even never wrapped with packets and processed inside TCP/IP without passing them to levels below.
This data can be intercepted only with LSP or TDI filter driver.
PS:
Hm i’ve tested that for MySQL(port 33056) and posgreSQL (port: 5433). The packages from postgreSQL couldn’t be captured, but the messages from mysql are captured perfectly 🙄