LAN is not available, LAN is not reachable solution

This problem is the most basic sharing problem of XP, by default, XP's firewall will restrict all access from the outside, and XP has a security mechanism to prevent access from the Internet, whether it is legal or illegal, so the problem you have above, the solution is very simple, as follows:

1. Right-click "Online Neighbors" ==>"Local connection"Properties ==> "Advanced" tab == > Windows Firewall, click "Settings" ==> select the "Exceptions" tab.

There is a "File and Print Sharing" that can be checked in the front.

2. "Control Panel" ==> "Management Tools" ==> "Local Security Policy".

On the left, under "Security Settings", click on "Local Policies" ==> "Security Options".

On the right, look for "Network Access" ==> the sharing and security mode of the local account and double-click to open it.

Select Classic - Local users to authenticate themselves

Problem solved: At this time, the system will prompt you with the username and password when logging in to XP, just enter it.

Note: Because the security features of XP administrator account is not allowed to log in remotely, the guest user is not enabled, do not use these two accounts to log in, create a new one, if you adjust the permissions of these two users, also in the above security options, see for yourself to change, but don't change randomly, because many settings have been changed, although it will not affect the system, but it may open up the possibility of virus invasion or other attacks, so just change what you know.

It's a bit complicated to set up for the first time, so it's good to be familiar with it.

Once set, the first inaccessible denied access issue is solved.

The second problem is caused by the fact that the visiting account is not opened, it is recommended not to open it, and you can also use the above process to modify it.

Control Panel, Administrative Tools, Local Security Policies, Local Policies, Security Options, Find "Network Access, Local Account Sharing, and Security Mode, Select."

Classic, local users with their own authentication".

Restart again, and then disable the guest user.

Remember to turn off your firewall.

Check the guest user of the system.

Turn off the firewall or a somewhat defensive antivirus.

Turn off all firewalls, including the router's firewall.

What should I do if the LAN connection is not working? Still confused! Let me give you a detailed introduction to the solution to the LAN failure! Hope it helps!

LAN is not available for resolution:

1. Inspection

The inspection here refers to the inspection of the cable, that is, the cable between the computer and the network interface.

In the case of a small 10 100 network, only open circuits, short circuits and cabling are sufficient, and in the case of Gigabit Ethernet, there is also a need to check for crosstalk and impedance in the cables.

2. Confirmation

Confirmation, which lets you confirm that you are connected to the switch.

Once you've confirmed that it's not the individual computer causing the problem, you connect the portable network tool to the office line, check if the link can be established, and then check the port configuration again to make sure the port is available and configured with the correct VLAN.

3. Application

After "confirming" and establishing the link, use the tool to request a DHCP address from the server. You should ensure that the assigned address matches the corresponding subnet; Verify the subnet mask; Confirm the default gateway and DNS server address.

If it fails to get a response from the server, it should be able to detect the corresponding subnet by analyzing the broadcast traffic. Check the switch ports that the tool is connected to with the Cisco Discovery Protocol (CDP) report obtained from the switch, and confirm the subnet configuration.

4. Ping

Ping devices on the network.

After obtaining the DHCP address, you can use the tool to ping a device outside the LAN (it is recommended to directly ping a ** home page address). This step will help you confirm that the DHCP specification is configured correctly and that the network data is being sent correctly through the route.

5. Inspection

Check, the test is the speed of the duplex mode setting.

In fact, after the fourth step, if the network is not connected, you can think about whether the previous four steps are missing, and if not, please consider this step again.

Link performance failures, such as duplex pattern mismatch, speed mismatch, and statically configured IP addresses, can only be detected. Therefore, I recommend that you use a tool with the detection function for the network management to detect. If a duplex pattern mismatch is detected, confirm that both the computer and switch ports are set to the automatic protocol.

Once all these parameters have been verified, the link between the computer and the network can be canceled. If the fault persists, you may need to use a more sophisticated network diagnostic tool.

As an administrator, these network problems should be a very small pediatric matter, and this tutorial is mainly for network administrators, but because the article is easy to understand, you can also learn to do it if you are interested.

From the situation you described, the port problem has been ruled out, and the general ordinary router can not restrict the port, then check whether it is other computers that cause you to be unable to access the network, make sure that there is only your computer in the network, and do not let other computers connect to the Internet, this step is to eliminate the influence of other computers; The next step is to check whether the settings of the router cause you to be unable to access the Internet, if only your computer is in the network, or can not access the Internet, you have to check the configuration of the router, it is possible that someone has configured not to let you access the Internet.

Thank you, my computer has been off for a whole month, and I was able to go up at 11 o'clock last night! I'm still wondering, why did I go up by myself, the IP can also be searched, it used to be an automatic search IP, and when I was able to go up last night, I changed it to a fixed one, so as not to search for ip@ in the future