If you don’t mind resetting your Network Settings, (passwords, etc.) you can delete the following files and set it up again:
Or, if you're one of those odd birds who subscribe to the strange notion that simply re-typing your password is a LOT easier than re-typing everything, passwords included, then follow the instructions on the aforementioned link:
- Lock the padlock in any other pane of System Preferences (the Security pane is a good place) before going to the Network pane.
- Go to the Network pane (the locked padlock will forestall the dreaded message).
- Unlock the padlock. (That's OK, now that you're on the Network pane. The message only happens if the padlock is already unlocked on arrival there.)
- Scan all of your settings (not just the active location) looking at each PPP or PPPoE pane of every interface, looking for where you have "Save password" checked. Where it's checked (typically only one or two places), uncheck it and re-type the password (which will cause it to be re-checked).
That's it. Each saved password needs this treatment only once. The repair is permanent. You can leave the padlock unlocked if you desire.
No files to remove. No complicated network settings to remember and re-enter. You do have to re-enter your passwords, but you'd have to do that anyway.
Or you can set up a new user, change the network settings and the delete the new user.
That won't work. The old user will still have the original problem.