Recently, after forcibly uninstalling an antivirus software installed in Windows XP system, I found that the laptop suddenly couldn't access the Internet. When I opened the online neighbor properties window and checked the properties of the local connection, I saw that the IP address in the TCP/IP parameter setting interface "much" into "0.0.0.0". However, the author previously set the IP address of the notebook to be dynamically acquired, but now there is no modification to the network parameters. How does the IP address become "0.0.0.0"?
When I searched the address "0.0.0.0" online, I found that the address does not represent any computer or network. Obviously, the IP address of the local computer has become "0.0.0.0", which means that the local network interface has not been opened correctly. That is to say, the laptop has not obtained a real and valid IP address from the DHCP server, so the laptop will naturally fail to access the Internet.
So what exactly causes the IP address of the local computer to become "0.0.0.0"? Considering that the author has not made any changes to the network parameters before and after the IP address mutation, and before uninstalling this antivirus software, everything is still normal to surf the Internet; it seems that the mutation of the IP address must be caused by this antivirus software. In order to further verify my guess, I opened the log information of the Windows XP system and found some answers from it.
As expected, the log file clearly prompted the system to have an error of 7300 and the DHCP service could not start normally. In order to figure out the reasons for the 7300 error, the author went online to check this information. After several efforts, he finally understood that the occurrence of the 7300 error is mainly caused by the inability to initialize the DHCP client service normally. Once the DHCP service cannot be started correctly, the Windows XP system workstation will naturally not be able to dynamically obtain the legal IP address from the DHCP server. This is obviously the reason why the IP address of the local computer suddenly becomes "0.0.0.0".
According to the prompts of the log file, the author further discovered that the reason why the DHCP client service cannot be initialized normally is mainly because the SYMTDI service, which has a dependency relationship with the DHCP service, cannot start normally. The SYMTDI service will be automatically monitored by many antivirus software during operation. Once the antivirus software is forcibly uninstalled, the SYMTDI service will be implicated and cannot be started normally.
To enable the DHCP service to start normally, the dependence between the service and the SYMTDI service can be disabled. To do this, you can follow the following steps:
Click the "Start"/"Run" command in turn. In the pop-up system run dialog box, enter the string command "Regedit", and after clicking the "OK" button, open the system's registry editing window;
Expand the registry branch HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\DHCP in the right sub-window corresponding to the "DHCP" branch, double-click the "DependOnService" key value, and in the properties setting box that appears next, delete the SYMTDI value data, and finally click the "OK" button, and restart the computer system. In the future, follow the normal method and reset the Internet access parameters to ensure that the local computer can access the Internet normally.