问题描述：连接后一直显示Failed to connect to ISP server, maybe WAN port cable is unplugged，无法建立连接，我是武汉电信宽带，电脑上直接拨号没问题。 以下是日志截图： 10 INFO 0045:Failed to connect to ISP server, maybe WAN port cable is unplugged. 9 INFO 0045:PPPOE: request timeout. 8 INFO 0045:发送PADI,请求建立连接. 7 INFO 0041:发送PADI,请求建立连接. 6 INFO 0038:发送PADI,请求建立连接. 5 INFO 0035:发送PADI,请求建立连接. 4 INFO 0035:PPPoE 开启手动连接. 3 INFO 0025:DHCPS: 1:0x7ce9d3113a78, 192.168.1.100, ACK in request. 2 INFO 0025:DHCPS: 1:0x7ce9d3113a78, NAK in request. 1 INFO 0000:系统启动成功. Time = 2006-01-01 8:15:57 958s H-Ver = WR740N 5.0/6.0 00000000 : S-Ver = 4.18.29 Build 110909 Rel.35946n L = 192.168.1.254 : M = 255.255.255.0 W1 = PPPoE : W = 0.0.0.0 : M = 0.0.0.0 : G = 0.0.0.0 Free=5028, Busy=2, Bind=0, Inv=0/19, Bc=0/0, Dns=78, cl=383, fc=0/0, sq=0/0