Cannot connect to internet anymore...

IBook G4
OS 10.4.11 Ethernet, DSL modem connected by wire (PPoE)
For the past 3 days, I have been trying to figure out what happened inside my IBook and I am going nowhere. I hope this rings a bell for someone out there.
I was connected to the Internet, disconnected for 1h and when I tried to connect again, I got the message AUTHENTIFICATION FAILED. I checked with my ISP provider and everything is fine at their end.
I used the diagnostics tool and got the message the settings had been changed by an application. That's happened before but always fixed itself so I tried again. But this time, it was useless. I got rid of the settings altogether and created new ones. Still the same message AUTHENTIFICATION FAILED.
When I uncheck the "connect using PPoE" box, the DHCP menu in the tab TCP/IP shows an IP address (10.64.64.64) and a router (10.112.112.112).I don't even owns a router... But sometimes that tab remains blank.
I tried to connect with my internal modem. After all the modem noise and the contacting PPP server, establishing connection.....I got a AUTHENTIFICATION FAILED, again.
I have created and tossed many settings, trying to work my way around this problem but I am going nowhere.
Very often, I get a message from the system keychain: pppd wants permission to use ppp password item in your keychain (deny, allow once, always allow). I've been connecting for years with this computer and can't remember EVER seeing this request.
One other thing, Keychain used to be unlocked when I logged in. Now it's always locked. But my password unlocks it.
In the computer's log, I see 2 error messages that keep coming back:
PAP authentification failed and Error unable to get extended status.
HELP !!!

I am having the same "Authentication Failed" DSL problem. Everything was operating OK, 10.4.11 was installed at least 2 weeks ago on the G5 with the problem. I did notice the "Settings have been changed.." message around the time the problem started. The first problem was not being able to find the server, then when that was corrected the "Authentication" problem surfaced. I also have a G4 running OS 10.2 on a different DSL. When I configured the G4 to connect to the problem DSL everything worked fine, so I'm 100% sure the problem is not in the ethernet cable, modem, DSL, or provider. I also tried the security update "Settings have been.." fix by removing the System Config files. This did not fix the problem. It's almost as though the Mac system is not accepting or changes the password typed into the Network PPPoe window. The DSL password is 17 characters, but it worked on the current system for 2yrs 10 months, failing on 10/28/08. What's puzzling is that everything was fine then went kaput without anything being done to the system. Any help would be greatly appreciated.

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