为何我这边连接VPN的时候老是拨号拨不上去，或者每次拨号拨上去马上就断开， 连接最多只能持续2分钟，少的时候几十秒，甚至根本拨不上去。拨上去的时候能 分配IP。 机器在局域网里面，通过路由器连接到外网，然后拨号到VPN。外网一直能连接上 May 8 10:40:29 MasServer l2tpd[3482]: Connecting to host 218.206.191.53, port 1701 May 8 10:40:30 MasServer l2tpd[3482]: Connection established to 218.206.191.53, 1701. Local: 18361, Remote: 15756. May 8 10:40:30 MasServer l2tpd[3482]: Calling on tunnel 18361 May 8 10:40:30 MasServer l2tpd[3482]: Call established with 218.206.191.53, Local: 45647, Remote: 23408, Serial: 453 May 8 10:40:30 MasServer pppd[13860]: pppd 2.4.4 started by root, uid 0 May 8 10:40:30 MasServer pppd[13860]: Using interface ppp0 May 8 10:40:30 MasServer pppd[13860]: Connect: ppp0 <--> /dev/pts/1 May 8 10:40:32 MasServer pppd[13860]: CHAP authentication failed: permission denied May 8 10:40:32 MasServer pppd[13860]: CHAP authentication failed May 8 10:40:32 MasServer pppd[13860]: Connection terminated. May 8 10:40:32 MasServer pppd[13860]: Exit. May 8 10:40:32 MasServer l2tpd[3482]: call_close: Call 45647 to 218.206.191.53 disconnected May 8 10:40:32 MasServer l2tpd[3482]: handle_avps: Bad exit status handling attribute 1 (Result Code) on mandatory packet. 想让大家看看是什么原因？我已经把Server的防火墙服务关闭了，会不会是上面的 路由器防火墙问题，还有人告诉我有可能是防火墙会自动关闭空闲的连接，也有人 告诉我可能是两台机器用同一个帐号去拨号导致的冲突（不过我已经联系了拨号服 务提供者，他们说只看见我一个在拨号），还有可能是不是配置错误，但是我在自 己公司配置的时候 都没有出问题，拿到客户那里安装的时候就出问题了
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