@maverick_slo:
Wait, was pppoe connect with "." vlans been fixed in 2.4.2?
Yes.
@machinery
I just saw that you posted the log from the 11th connect attempt. Please see if you can find the first one and post it. It's not uncommon for ISPs to ignore consecutive login attempts after a few failures, your log looks just like that.
You can try to disconnect the pfSense box from the modem, check that PPPoE password and username are correct, wait an hour or so and then try again.
Another possibility:
If your ISP isn't validating connections based on the username/password combination but based on the port id in the DSLAM, and you made the first connection from the Linux computer, then it's possible that it (for a time) expects new connections to come from the same MAC address. Similiar to how cable works for many ISPs. In that case you can try to use the MAC from the Linux computer for the PPPoE connection on the pfSense.