上不了网显示受限制或无连接怎么办
我家里是lan上网的，平时需要输入账号，这2年取消了，不过前段时间可以不用账号直接上网的（取消后的这2年），但是最近不行了，显示受限制或无连接，应该是dhcp没有分配地址。以前曾经也没有分配地址的，但是手动设成他分的地址却可以上，最近就不行了。
以前设的地址是：
ip：192.168.1.143
掩码：255.255.255
dns：202.96.128.86
最近这样设却不行了，不过他分配个地址就可以上，请问怎么解决？
怎么弄才能继续上网？！
第1个回答 2009-01-23
[编辑本段]ADSL掉线处理方法
ADSL掉线涉及到多方面的问题，包括线路故障(线路干扰)、ADSL Modem故障(发热、质量、兼容性)、网卡故障(速度慢、驱动程序陈旧)等等。运营商与用户应做以下常规检查：ADSL电话线接头是否稳妥可靠：是否远离电源线和大功率电子设备；ADSL入户线和分离器之间是否安装电话分机、传真机、计费器等设备：是否正确安装分离器；淘汰老式的ISA网卡，换成10/100M的PCI网卡及最新驱动程序；ADSL Modem散热是否良好；ADSL Modem指示灯状态是否正常。 ADSL掉线的原因和处理方法如下：
(1)接地线质量问题。 PC接地性能一定要好。否则静电会影响ADSL的传输速率甚至会引起掉线。一般PC接地电阻应小于10Ω。另外，由于施工时电源布放不规范，有的没有接地线，或地线质量不合格，也会影响网络设备的正常使用，甚至出现掉线问题，应及时整改。
(2)线路有强干扰源。 距离用户电缆线路100m内的无线电发射塔、电焊机、电车或高压电力变压器等强信号干扰源，使用户下线接收杂波(铜包钢线屏蔽弱．接收信号能力强)，对用户线引起强干扰。受干扰的信号往往是从无屏蔽的下线部分进入，因为中继电缆有屏蔽层，干扰影响很小，如果在干扰大的地方用一些带屏蔽的下线，就会减少因干扰造成的速率不稳定或掉线。另外，电源线不可与ADSL线路并行，以防发生串扰导致ADSL故障。
(3)网卡质量不稳定。 故障现象是网络只要一断开,再也连不上。用户Modem的DSL灯常亮，基本排除线路故障，问题多数出在网卡上。如果排除了网线、微机、插槽的问题，一般为网卡质量不稳定，应及时更换网卡。
(4)用户线路距离远。 不规则掉线多由线路质量差或距离远引起，可用ADSL测试仪测试信号衰减和干扰强弱，找出比较好的线路替换。一般用户中继线路不应超过5km，从分线箱进入用户房间的电话下线不应超过100m。
(5)能上网，但电话掉线。 原因多为交接间端子板线卡断，因断线头和端子板距离很近，因此数据感应能通过，而语音过不去；如用户距局端很近，室内线混线也可造成上述故障。
(6)上网、通话不兼顾。 一般为外线绝缘不良或有接头接触不良。用户端外线绝缘不良，用户上网时一拿电话手柄告警灯就闪，WAN灯熄灭，修好外线后故障立刻解除。
(7)能通话，但上网掉线。 一般用户接错线的情况是把接Modem的线接在话机上，就会出现话机能用，而上网掉线。这时ADSL Modem状态灯LINE灯不亮。在查故障时应先仔细查看设备使用接线位置，平时尽量少变动，以免接错线。
(8)错误串电话分机。 由于不正确串接电话分机，从而造成串扰，引起上网数据畸变。如果必须使用电话分机，则应串接一个分离器。
[编辑本段]错误代码说明
602 The port is already open.
This error usually occurs under Windows 95/98 and indicates that there is no dial-up adapter present in the Network applet of the Control Panel. To resolve the problem, remove WinPoET, add a dial-up adapter, and then restart the PC.
You may also receive this error if you attempt to connect when WinPoET is already connected.
602错误，端口已经打开。原因：计算机上没有安装拨号网络，或连接已经连接。
604 Wrong information specified.
You have entered an incorrect user name or password. Try again.
604错误，你输入了不正确的用户名或密码。
617 The port or device is already disconnecting.
This error usually occurs under Windows 95/98 and indicates that there is no dial-up adapter present in the Network applet of the Control Panel. To resolve the problem, remove WinPoET, add a dial-up adapter, and then restart the PC.
617错误，端口已经断开。原因计算机没有拨号网络。
618 The port is not open.
This error usually occurs on Windows 95/98 and indicates that there is no dial-up adapter present in the Network applet of the Control Panel. To resolve the problem, remove WinPoET, add a dial-up adapter, and then restart the PC.
618错误，端口没有打开。原因计算机没有拨号网络。
619 The port is disconnected.OR The specified port is not connected.
This error could indicate a problem with your Internet Service Provider (ISP). Contact your ISP for assistance.
619错误，ISP错误，联系ISP以寻求帮助。
621 Cannot open the phone book file.
This error occurs on Windows NT 4.0 Workstation or Server. To resolve the problem, go the RAS settings and configure the iVasion PoET adapters for dial-out only.
621错误，不能打开电话本。解决：修改RAS的设置，使虚拟网卡可以拨出。
622 Cannot load the phone book file.
Same as error 621.
622错误，不能加载电话本。
623 Cannot find the phone book entry.
Same as error 621.
623错误，没找到电话本
624 Cannot write the phone book file.
Same as error 621.
624错误，不能写电话本文件
625 Invalid information in the phone book.
Same as error 621.
625错误，电话本中含有无效信息。
629 The port was disconnected by the remote machine.
You have entered an incorrect user name or password. Try again.
?OR ?The connection is not valid (for example, the cable is unplugged).
629错误，连接被远程计算机中断。原因；你输入了不正确的用户和密码，或连接是无效的（电缆被拔出）
630 The port was disconnected due to hardware failure.
This error occurs if you try to connect when WinPPPoverEthernet.exe is not running or is not fully loaded. Wait a moment and try again.
630错误，硬件故障。
631 The port was disconnected by the user.
You clicked Cancel on the WinPoET Dialer dialog box.
631错误，连接被用户中断。
633 The port is already in use or is not configured for Remote Access dial out.
On Windows 95/98, refer to error number 602 for information.
On Windows NT 4.0, refer to error number 621 for information.
633错误，端口正被使用。
634 Cannot register your computer on the remote network.
You have entered an incorrect user name or password. Try again.
?OR ?There is a problem with your ISP. Contact them for assistance.
634错误，不能在远程网络注册你的计算机。原因；你输入了错误的用户和密码，或ISP问题。
645 Internal authentication error.
Typically, this error occurs if you have not appended your user name with the correct AC-specified context. ?OR ?No dial-up adapter is installed. See Installing the iVasion PoET Adapter for Windows NT.
645错误，内部认证错误。
646 The account is not permitted to log on at this time of day.
Your account is time-restricted. Try again during your designated time period.
646错误，帐号此时不可使用，你的帐号有使用时间限制。
647 The account is disabled.
Your account is disabled. Contact your ISP for assistance.
647错误，帐号被禁止。
648 The password has expired.
Your password has expired. Contact your ISP for assistance.
648错误，密码已经到期。
649 The account does not have Remote Access permission.
You probably have entered an incorrect user name or password. Try again.
649错误，帐号没有远程访问许可，
651 Your modem (or other connecting device) has reported an error.
You may have either incorrectly installed WinPoET or removed the iVasion PoET adapter (in Windows 95/98). Remove WinPoET, restart your PC, and then install WinPoET again.
651错误，MODEM或连接设备报告错误。
652 Unrecognized response from the device.
You may have either incorrectly installed WinPoET or removed the iVasion PoET adapter (in Windows 95/98). Remove WinPoET, restart your PC, and then install WinPoET again.
652错误，无效的设备应答。
665 The port is not configured for Remote Access.
This error occurs under Windows NT (WKS or SVR). The solution is to go into the RAS settings and configure the iVasion PoET adapters for dial-out only, as well as the TCP/IP protocol only.
665错误，端口未被配置为可使用RAS。
678 No Response
678错误，远程计算机没有回应，原因是ADSL设备电源没有连接，或者是帐号使用期限已到！
691 Access denied because username and/or password is invalid on the domain.
You have entered an incorrect user name or password. Try again.
691错误，访问拒绝，因为用户或密码在域上无效。
692 Hardware failure in port or attached device.
This error occurs if you try to connect when WinPPPoverEthernet.exe is not running or is not fully loaded. Wait a moment and try again.
?OR ?On Windows NT, you may have reinstalled WinPoET without removing the previous installation adapters.
692错误，硬件错误。
708 The account has expired.
Your account has expired. Contact your ISP for assistance.
708错误，帐号已经到期。
711 RasMan initialization failure. Check the event log.
This error may occur on Windows NT. Reapply the Microsoft Windows NT Service Pack.
711错误，RAS管理初始化失败。
718 PPP timeout.
You have entered an incorrect user name or password. Try again.
?OR ?The connection is not valid (for example, the cable is unplugged).
718错误，PPP超时。原因：用户密码错误或连接无效。
719 PPP terminated by remote machine.
Although a valid connection is detected, it is not working. Contact your ISP for assistance.
719错误，PPP被远程机器中断。原因；虽然检测到有效的连接，但该连接不可工作，联系ISP请求帮助。
720 No PPP control protocols configured.
This error is generated when there is an Access Concentrator (AC) problem with your ISP; contact them for assistance.
720错误，没有PPP控制协议。该错误产生于ISP的AC（访问集中器）故障。联系ISP。
721 Remote PPP peer is not responding.
You have entered an incorrect user name or password. Try again.
?OR ?The connection is not valid (for example, the cable is unplugged).
721错误，远程PPP没有响应。
734 The PPP link control protocol has been terminated.
This error occurs on Windows NT if NetBIOS is not installed. In the Network applet of the Control Panel, install the NetBIOS Interface service.
734错误，PPP连接控制协议被终止。该错误通常发生在NT中没有安装NETBIOS时。
735 The requested address was rejected by the server.
You may have entered an IP address in the phone book entry. Remove the IP address and try again.
735错误，请求的地址被服务器拒绝。
739 The remote server cannot use the Windows NT encrypted password.
You may have selected an NT encrypted password in the phone book entry. Clear this check box and try again.
739错误，远程服务器不能使用加密口令。你可能选择了加密口令，请使用明文或可被服务器接受的口令方式。
751 Error occurred during dialing. Error code = 751. Extended error code = 0.
Both dial -up adapters are already in use by other connections.
751错误，拨号时发生错误。原因；所有的拨号网络都在被其他连接使用。
752 Error occurred during dialing. Error code = 752. Extended error code = 0.
This error occurs if the TCP/IP bindings have been removed from the Ethernet card. To resolve the problem, restart your computer.
752错误，拨号时发生错误。原因：网卡上TCP/IP协议绑定被删除了。
769错误，无法连接到指定目标。 网卡禁用。
说明：本错误代码是WINDOWS拨号网络的通用错误，适用范围是一切拨号网络，包括ADSL的WINPOET虚拟拨号。
ADSL掉线涉及到多方面的问题，包括线路故障(线路干扰)、ADSL Modem故障(发热、质量、兼容性)、网卡故障(速度慢、驱动程序陈旧)等等。运营商与用户应做以下常规检查：ADSL电话线接头是否稳妥可靠：是否远离电源线和大功率电子设备；ADSL入户线和分离器之间是否安装电话分机、传真机、计费器等设备：是否正确安装分离器；淘汰老式的ISA网卡，换成10/100M的PCI网卡及最新驱动程序；ADSL Modem散热是否良好；ADSL Modem指示灯状态是否正常。 ADSL掉线的原因和处理方法如下：
(1)接地线质量问题。 PC接地性能一定要好。否则静电会影响ADSL的传输速率甚至会引起掉线。一般PC接地电阻应小于10Ω。另外，由于施工时电源布放不规范，有的没有接地线，或地线质量不合格，也会影响网络设备的正常使用，甚至出现掉线问题，应及时整改。
(2)线路有强干扰源。 距离用户电缆线路100m内的无线电发射塔、电焊机、电车或高压电力变压器等强信号干扰源，使用户下线接收杂波(铜包钢线屏蔽弱．接收信号能力强)，对用户线引起强干扰。受干扰的信号往往是从无屏蔽的下线部分进入，因为中继电缆有屏蔽层，干扰影响很小，如果在干扰大的地方用一些带屏蔽的下线，就会减少因干扰造成的速率不稳定或掉线。另外，电源线不可与ADSL线路并行，以防发生串扰导致ADSL故障。
(3)网卡质量不稳定。 故障现象是网络只要一断开,再也连不上。用户Modem的DSL灯常亮，基本排除线路故障，问题多数出在网卡上。如果排除了网线、微机、插槽的问题，一般为网卡质量不稳定，应及时更换网卡。
(4)用户线路距离远。 不规则掉线多由线路质量差或距离远引起，可用ADSL测试仪测试信号衰减和干扰强弱，找出比较好的线路替换。一般用户中继线路不应超过5km，从分线箱进入用户房间的电话下线不应超过100m。
(5)能上网，但电话掉线。 原因多为交接间端子板线卡断，因断线头和端子板距离很近，因此数据感应能通过，而语音过不去；如用户距局端很近，室内线混线也可造成上述故障。
(6)上网、通话不兼顾。 一般为外线绝缘不良或有接头接触不良。用户端外线绝缘不良，用户上网时一拿电话手柄告警灯就闪，WAN灯熄灭，修好外线后故障立刻解除。
(7)能通话，但上网掉线。 一般用户接错线的情况是把接Modem的线接在话机上，就会出现话机能用，而上网掉线。这时ADSL Modem状态灯LINE灯不亮。在查故障时应先仔细查看设备使用接线位置，平时尽量少变动，以免接错线。
(8)错误串电话分机。 由于不正确串接电话分机，从而造成串扰，引起上网数据畸变。如果必须使用电话分机，则应串接一个分离器。
[编辑本段]错误代码说明
602 The port is already open.
This error usually occurs under Windows 95/98 and indicates that there is no dial-up adapter present in the Network applet of the Control Panel. To resolve the problem, remove WinPoET, add a dial-up adapter, and then restart the PC.
You may also receive this error if you attempt to connect when WinPoET is already connected.
602错误，端口已经打开。原因：计算机上没有安装拨号网络，或连接已经连接。
604 Wrong information specified.
You have entered an incorrect user name or password. Try again.
604错误，你输入了不正确的用户名或密码。
617 The port or device is already disconnecting.
This error usually occurs under Windows 95/98 and indicates that there is no dial-up adapter present in the Network applet of the Control Panel. To resolve the problem, remove WinPoET, add a dial-up adapter, and then restart the PC.
617错误，端口已经断开。原因计算机没有拨号网络。
618 The port is not open.
This error usually occurs on Windows 95/98 and indicates that there is no dial-up adapter present in the Network applet of the Control Panel. To resolve the problem, remove WinPoET, add a dial-up adapter, and then restart the PC.
618错误，端口没有打开。原因计算机没有拨号网络。
619 The port is disconnected.OR The specified port is not connected.
This error could indicate a problem with your Internet Service Provider (ISP). Contact your ISP for assistance.
619错误，ISP错误，联系ISP以寻求帮助。
621 Cannot open the phone book file.
This error occurs on Windows NT 4.0 Workstation or Server. To resolve the problem, go the RAS settings and configure the iVasion PoET adapters for dial-out only.
621错误，不能打开电话本。解决：修改RAS的设置，使虚拟网卡可以拨出。
622 Cannot load the phone book file.
Same as error 621.
622错误，不能加载电话本。
623 Cannot find the phone book entry.
Same as error 621.
623错误，没找到电话本
624 Cannot write the phone book file.
Same as error 621.
624错误，不能写电话本文件
625 Invalid information in the phone book.
Same as error 621.
625错误，电话本中含有无效信息。
629 The port was disconnected by the remote machine.
You have entered an incorrect user name or password. Try again.
?OR ?The connection is not valid (for example, the cable is unplugged).
629错误，连接被远程计算机中断。原因；你输入了不正确的用户和密码，或连接是无效的（电缆被拔出）
630 The port was disconnected due to hardware failure.
This error occurs if you try to connect when WinPPPoverEthernet.exe is not running or is not fully loaded. Wait a moment and try again.
630错误，硬件故障。
631 The port was disconnected by the user.
You clicked Cancel on the WinPoET Dialer dialog box.
631错误，连接被用户中断。
633 The port is already in use or is not configured for Remote Access dial out.
On Windows 95/98, refer to error number 602 for information.
On Windows NT 4.0, refer to error number 621 for information.
633错误，端口正被使用。
634 Cannot register your computer on the remote network.
You have entered an incorrect user name or password. Try again.
?OR ?There is a problem with your ISP. Contact them for assistance.
634错误，不能在远程网络注册你的计算机。原因；你输入了错误的用户和密码，或ISP问题。
645 Internal authentication error.
Typically, this error occurs if you have not appended your user name with the correct AC-specified context. ?OR ?No dial-up adapter is installed. See Installing the iVasion PoET Adapter for Windows NT.
645错误，内部认证错误。
646 The account is not permitted to log on at this time of day.
Your account is time-restricted. Try again during your designated time period.
646错误，帐号此时不可使用，你的帐号有使用时间限制。
647 The account is disabled.
Your account is disabled. Contact your ISP for assistance.
647错误，帐号被禁止。
648 The password has expired.
Your password has expired. Contact your ISP for assistance.
648错误，密码已经到期。
649 The account does not have Remote Access permission.
You probably have entered an incorrect user name or password. Try again.
649错误，帐号没有远程访问许可，
651 Your modem (or other connecting device) has reported an error.
You may have either incorrectly installed WinPoET or removed the iVasion PoET adapter (in Windows 95/98). Remove WinPoET, restart your PC, and then install WinPoET again.
651错误，MODEM或连接设备报告错误。
652 Unrecognized response from the device.
You may have either incorrectly installed WinPoET or removed the iVasion PoET adapter (in Windows 95/98). Remove WinPoET, restart your PC, and then install WinPoET again.
652错误，无效的设备应答。
665 The port is not configured for Remote Access.
This error occurs under Windows NT (WKS or SVR). The solution is to go into the RAS settings and configure the iVasion PoET adapters for dial-out only, as well as the TCP/IP protocol only.
665错误，端口未被配置为可使用RAS。
678 No Response
678错误，远程计算机没有回应，原因是ADSL设备电源没有连接，或者是帐号使用期限已到！
691 Access denied because username and/or password is invalid on the domain.
You have entered an incorrect user name or password. Try again.
691错误，访问拒绝，因为用户或密码在域上无效。
692 Hardware failure in port or attached device.
This error occurs if you try to connect when WinPPPoverEthernet.exe is not running or is not fully loaded. Wait a moment and try again.
?OR ?On Windows NT, you may have reinstalled WinPoET without removing the previous installation adapters.
692错误，硬件错误。
708 The account has expired.
Your account has expired. Contact your ISP for assistance.
708错误，帐号已经到期。
711 RasMan initialization failure. Check the event log.
This error may occur on Windows NT. Reapply the Microsoft Windows NT Service Pack.
711错误，RAS管理初始化失败。
718 PPP timeout.
You have entered an incorrect user name or password. Try again.
?OR ?The connection is not valid (for example, the cable is unplugged).
718错误，PPP超时。原因：用户密码错误或连接无效。
719 PPP terminated by remote machine.
Although a valid connection is detected, it is not working. Contact your ISP for assistance.
719错误，PPP被远程机器中断。原因；虽然检测到有效的连接，但该连接不可工作，联系ISP请求帮助。
720 No PPP control protocols configured.
This error is generated when there is an Access Concentrator (AC) problem with your ISP; contact them for assistance.
720错误，没有PPP控制协议。该错误产生于ISP的AC（访问集中器）故障。联系ISP。
721 Remote PPP peer is not responding.
You have entered an incorrect user name or password. Try again.
?OR ?The connection is not valid (for example, the cable is unplugged).
721错误，远程PPP没有响应。
734 The PPP link control protocol has been terminated.
This error occurs on Windows NT if NetBIOS is not installed. In the Network applet of the Control Panel, install the NetBIOS Interface service.
734错误，PPP连接控制协议被终止。该错误通常发生在NT中没有安装NETBIOS时。
735 The requested address was rejected by the server.
You may have entered an IP address in the phone book entry. Remove the IP address and try again.
735错误，请求的地址被服务器拒绝。
739 The remote server cannot use the Windows NT encrypted password.
You may have selected an NT encrypted password in the phone book entry. Clear this check box and try again.
739错误，远程服务器不能使用加密口令。你可能选择了加密口令，请使用明文或可被服务器接受的口令方式。
751 Error occurred during dialing. Error code = 751. Extended error code = 0.
Both dial -up adapters are already in use by other connections.
751错误，拨号时发生错误。原因；所有的拨号网络都在被其他连接使用。
752 Error occurred during dialing. Error code = 752. Extended error code = 0.
This error occurs if the TCP/IP bindings have been removed from the Ethernet card. To resolve the problem, restart your computer.
752错误，拨号时发生错误。原因：网卡上TCP/IP协议绑定被删除了。
769错误，无法连接到指定目标。 网卡禁用。
说明：本错误代码是WINDOWS拨号网络的通用错误，适用范围是一切拨号网络，包括ADSL的WINPOET虚拟拨号。
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