pppoe出错：CHAP authentication failed

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用pppoeconf佩好pppoe，运行pon dsl-provider出错：
Jun 29 11:06:33 ht pppd[964]: CHAP authentication failed: CHAP authentication failure, unit 1436
Jun 29 11:06:33 ht pppd[964]: Connection terminated.
Jun 29 11:06:33 ht pppd[964]: tcflush failed: Input/output error
Jun 29 11:06:33 ht pppd[964]: Using interface ppp0
Jun 29 11:06:33 ht pppd[964]: Connect: ppp0 <--> /dev/pts/3，
请问怎么解决？谢谢！