The hosts file cannot be saved after being modified.

The hosts file is a text file used to map IP addresses and host domain names, and is used to solve domain name resolution problems. In some cases, we may need to modify the hosts file, add or delete some entries. However, sometimes we may encounter the problem that the hosts file cannot be saved after modification. This article will explore why this problem may occur and provide some solutions.

First of all, the hosts file is located in the system directory of the operating system. For example, the path under the Windows operating system is C:WindowsSystem32driversetc, and the path under the macOS and Linux operating systems is /etc/hosts. Since the hosts file is an important file of the operating system, modifying it requires administrator privileges. If we do not open a text editor or command prompt as an administrator, we cannot save modifications to the hosts file.

The solution to this problem is simple, just reopen the text editor or command prompt as an administrator. In Windows operating systems, we can open a text editor or command prompt by right-clicking on their icon and selecting "Run as administrator." In macOS and Linux operating systems, we can obtain administrator privileges by using the sudo command in the terminal.

The second reason that may cause the hosts file to fail to be saved is the setting of file permissions. In some cases, the hosts file may be set to read-only attribute, so that it cannot be modified and saved. We can view the properties of the file by right-clicking the hosts file and selecting "Properties". If the "Read Only" option is checked, you need to uncheck it in order to modify and save.

In addition, some security software or anti-virus software may also prevent modifications to the hosts file. This is because modifications to the hosts file may be used to block some malicious websites or advertisements. In this case, we need to temporarily turn off or configure the security software or anti-virus software to allow modifications to the hosts file. Please note that before doing these operations, it is important to make sure that we obtain the hosts file from a trusted source and know that the modifications we make are safe.

In addition, if we make some grammatical errors or formatting errors when editing the hosts file, it may also cause the file to fail to be saved. The format of the hosts file should be a correspondence between an IP address and a domain name per line, separated by spaces or tabs. If we accidentally add extra spaces or tabs, or forget to add a newline character at the end of a line, the file will become invalid. In this case we can check and correct the errors and make sure there are newlines between each line.

Finally, if the above method still cannot solve the problem, we can try to modify the hosts file in safe mode. Safe mode is a mode that loads only the most basic drivers and services when starting the operating system, which can eliminate problems related to the operating system. We can enter safe mode by pressing a specific function key (such as the F8 key) when restarting the computer. In safe mode, we can open a text editor or command prompt as an administrator and try to modify and save the hosts file.

In short, when we encounter the problem of being unable to save when modifying the hosts file, there are several possible reasons to consider. We need to open a text editor or command prompt as an administrator, check file permissions and security software settings, make sure the file is in the correct format, and try to modify it in safe mode if necessary. With these methods, we should be able to successfully modify and save the hosts file.

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