The LAN suddenly cannot be shared, and the computer suddenly cannot be shared LAN .

There are a lot of LAN settings in the original system, and users who are not familiar with this may be overwhelmed and fail to get the LAN mutual access. The system is specially written in batches that can easily turn on (or off) LAN mutual access.

When the system is just installed, the security is relatively high, and the users of the stand-alone dial-up Internet can get the greatest protection. At this time, the LAN is not available and cannot be accessed by other machines.

In the case of multi-machine Internet access, the LAN mutual access function is necessary. Multi-machine Internet access is generally done with a router, when the computer is not exposed to the external network, and the commonly used IPC$ intrusion method is ineffective against the router. In this case, please run the batch processing of "Enable LAN Sharing" to solve the problem in one move.

If you'd like to learn what exactly needs to be modified**, read below.

The first level of LAN mutual access:

Operating system default: An empty connection can be established using the ipc$ channel, and the number of accounts on the machine can be enumerated anonymously. Obviously, there are certain safety risks.

Hackers can use the scanner to find a computer that is open to IPC$ sharing, and anonymously enumerate all user accounts on that machine, which can be easily hacked if the user's account does not have a password. Null connections have been disabled in this system. In this way, even if the user does not have a password, there is not much risk in surfing the Internet.

However, it affects the mutual access of the local area network.

The second level of LAN mutual access:

Local Security Policy - Security Options - Accounts: Local accounts with blank passwords are only allowed to log in to the console. The system default is: Enabled.

Login failed: User account restrictions .........This is due to a security policy in the XP system that prevents others from accessing your computer when you have an empty password. If your computer is home and you don't need a password, you should set it to:

Disabled. The third level of LAN mutual access:

Control Panel - Firewall - Exceptions - File and Printer Sharing. System default: Do not select this option.

Hehe, it's really infuriating. This is because XP also has a level, which is the firewall, which must be allowed by the firewall.

Knowledge: IPC$ intrusion is a common tactic used by hackers. The IPC$ vulnerability cannot pass through the router, so users who use the router to access the Internet do not have to worry about the hidden dangers of opening up LAN sharing.

But beware: the router will be scanned and stolen the password of the ADSL account stored inside. So don't be careless, quickly change the default username and password of the router.

According to the situation and instructions, it should be an internal LAN environment, if remote control is used, it is recommended to set and exclude as follows:

Second, the remote client is set up as follows.

Second: Run Open Local Security Settings to set as follows:

Network access, and remote desktop users here I am just an example in the capacity of administrator.

The deactivation option is chosen here because the client system does not have a password. The specific situation can be set as appropriate.

Generally, after the above settings and checks are correct, the client can be remotely connected to the control end.

Note: Since what you said is still not clear, I only follow some key settings of the remote connection here, and some options in the "Remote Connection" dialog box have nothing to do with whether the remote connection is successful or not. The above case is a simulation operation of my virtual machine, I hope it will be helpful to you.

The computer LAN sharing can't be opened, and the password is correct, so I finally found a solution!

Have you installed a firewall, or used 360 to optimize your system, if so, you may have set it off to prevent others from attacking.