There is one thing to try on the printer, and if that fails, 1 thing to try on the Mac, although the Mac fix should already have been done to make the 6605 work since it is older.
1. EWS > Connectivity > Ethernet > Common > Edit and change IP Mode to IPv4
2.
- Open the Terminal app, which is in the Utilities folder of your Applications folder.
- Type sudo /usr/libexec/configureLocalKDCand press Return.
- Enter your administrator password and press Return.
- Quit the Terminal app.