The WAAS doesn't play nicely with old legacy mainframe LPR printing. I'm not mainframe guy, which is why I don't know the exact details to how the application was written. I was hoping this was resolved in 4.2.1 but we're still running into the same issue, work around is to bypass it completely. The problem is for every new print job it uses the same source port 721 or 722 and connects on port 515. You will have multiple syns that show up as either 721 or 722 continuously.