No network after uninstalling avast. Problems updating AVAST antivirus. How to restore the local network after Avast
But no viruses. No internet - no problem
On December 5-6, many users of the AVAST antivirus encountered such a problem: for no apparent reason, the connection to the Internet and the local network was lost. This was preceded by the discovery by him of a certain Win32:Malware-gen rootkit, after the removal of which these misadventures begin for users. File turned out to be a virus tcpip.sys, which is responsible for network connections in the computer. This false positive led to catastrophic consequences: the activity of many thousands of users was paralyzed, the phones of providers were overheated red from calls from disgruntled customers, service departments and system administrators were knocked down without lunch, sleep and rest, eliminating the consequences of this collapse.
The first thing to do was, of course, ignore this warning and add the tcpip.sys file to the exclusion list.
But if you are reading these lines, then most likely you or someone you know has already fallen for this bait and now he has no network activity: no sites open, no LAN, returns result "Setting up the IP protocol for Windows. An internal error has occurred: This request is not supported. Contact Microsoft Product Support Services for further assistance. Additional Information: Failed to query hostname." Team ping returns result "Unable to access the IP driver. Error code 2".
In the System Event Log, we see the following warning: "The service 'DHCP Client' is dependent on the service 'TCP/IP Protocol Driver' which failed to start due to an error..."
The "DNS Client" and "DHCP Client" services do not work for the same reason.
How to restore the Internet and the network?
Options for solving this problem after a long unwillingness to admit the problem appeared on the official website of Avast.
For "non-advanced" users (and for those who are too lazy to understand), the user "Obramko" (forum.avast.com) created a couple of programs that automatically solve this problem:
- Download the file for your version of Windows, transfer it to a flash drive or other storage medium.
- Disable your antivirus (Screen management - disable everything permanently).
- Run the file.
- Reboot your computer.
- Update your antivirus and turn it back on (Screen management - turn on all). After the update, it no longer blocks the Internet and the network, and it can be successfully used further.
Summary
From December 5, 2012, there was a blocking of the Internet among users of Russian operating systems Microsoft Windows xp. The problem arose due to an error by the employees of the anti-virus company, a signature was released that damaged the TCP / IP protocol driver. On the 5th and 6th of December, all providers and services were "on their ears" - the Internet was lost for users of Avast antivirus. The solution was found quickly, but the sediment from such work of the most popular antivirus remained.
« Avast blocked internet"- this problem is solved in several ways:
Solution #1 in 99% it helps users restore the Internet (even if you have already uninstalled the antivirus itself - you can use Solution #1, just ignore the instructions on enabling / disabling Avast).
Download the file from the link: here (mirror): http://depositfiles.com/files/jx9xqxtes
Instruction:
Download the avastfix.zip file from a friend/comrade/relative/neighbor who has Internet access (see the link above for XP SP3) to your flash drive/CD-R;
Unpack the avastfix.zip archive on the faulty computer/laptop( right click mouse over the file - "extract all");
Disable Avast: right-click on the Avast icon near the clock, select "manage avast screens", then select "disable permanently";
Run the fixtcpip.bat file, which is located inside the folder you unpacked, after that the computer will reboot;
Update Avast databases to latest version(double-click on the Avast icon near the clock, select "maintenance" - "update" - "update the scan engine and virus definitions"), enable avast: right-click on the Avast icon near the clock, select "manage avast screens", then select "turn on all screens".
ATTENTION! In very rare cases, you may have an "old" operating system Windows XP installed with a second service pack (Windows XP SP2). If you don't know what version you have operating system XP SP2 or XP SP3, you can find out about this from the properties of the computer: click Start - right-click on "My Computer" - select "properties" and it will say what Service Pack you have - 2 or 3.
Or download from here (mirror): http://depositfiles.com/files/a69gvaj6w
Solution #2
It is advised to first restore to the last working restore point, install Avast again and select "Ignore" when a message about this detection appears.
System Restore:
Pull out the cable with the Internet / USB-modem before restoring the system. Start button - Accessories - System Tools - System Restore - select a restore point earlier than December 5 and perform a restore. After restoring the system, uninstall avast through the "Add or Remove Programs" in the control panel, insert the cable / modem.
Reinstall Avast:
How to do a complete reinstallation of avast! Free/Pro/IS
1. Download and save the full installer of avast! Free/Pro/IS.
2. Download and save the avast!
3. Remove the installed copy of avast! Free/Pro/IS
4. Restart your computer in safe mode.
5. Launch the avast! Free/Pro/IS (file aswclear.exe).
6. Specify the version of the program and its folder (if the program was not installed in the default folder).
7. Click the Uninstall button and wait for the uninstall test to complete.
8. Close the uninstall utility window and agree to restart the computer in normal (normal) mode.
9. Install avast! Free/Pro/IS from the downloaded installer.
10. Restart your computer to complete the installation.
Note: The avast! Free/Pro/IS can be used without first uninstalling the program through the Windows Control Panel. In this case, you must first disable the self-protection module: open the main program window => Settings => Troubleshooting => uncheck Enable self-defense module avast!
If, after installation, the program did not request permission for boot scanning, it is recommended to assign it manually.
Don't forget to re-register free version or enter license information in paid.
Solution #3
Go to the folder C:/windows/system32/dllcache, where the backup copy of tcpip.sys is located and copy (but not move) it to C:/windows/System32/drivers, then restart the computer. Or Replace the tcpip.sys file with the file from the installation disk (here it is, in zip archive).
Important: The tcpip.sys file must be added not to the %Windows%/system32 folder, but to WINDOWS\system32\drivers
Solution #4
1. Boot into Safe Mode.
2. Start-Run-regedit and delete 2 keys in the registry.
HKEY_LOCAL_MACHINE/System/CurrentControlSet/Services/Winsock
HKEY_LOCAL_MACHINE/System/CurrentControlSet/Services/WinSock2
3. Go to the folder% Windows% / inf find the file Nettcpip.inf, open it, find the section and in the entry Characteristics = 0xa0 replace 0xa0 with 0x80
4. Go to Network Connections, right-click on your network connection - Properties.
Open the General tab - click Install, Protocol and Add in sequence.
In the Select Network Protocols window, click Install from Disk.
In the Copy files from disk: type C:/windows/inf and click OK.
Highlight the Internet Protocol (TCP/IP) item and press the OK button.
We return to the LAN connection properties screen, the Delete button is now active.
Now remove the Internet Protocol (TCP/IP).
It is advisable to replace the tcpip.sys file with the file from the installation disk (here it is, in the zip archive), before installing the protocol. You need to copy it to the folders %Windows%/system32/dllcache and %Windows%/system32, then install the protocol.
To restart a computer
Go back to Network Connections and install the Internet Protocol (TCP / IP) again using the Install from disk button and the path c: / windows / inf
And restart your computer again.
Solution 5
In some cases, if the three solutions to the problem did not help, it is also necessary, in addition to tcpip.sys, to copy the nettcpip.inf file from a working PC running XP to the Windows / inf folder and repeat the steps from Solution 4.
Solution 6
Copy the "working" (see Solution 1.3) tcpip.sys file to c: / windows / system32 / drivers
Then go to the device manager - "view" - "show hidden devices". select "Non-Plug and Play Device Drivers" - "Tcp / IP Protocol Driver" with the right button "properties". driver tab - autoload, type set to "system". restart the computer.
Solution 7
Use the TCPIP.Sys RestoreTool utility from UnHackMe. Link: http://www.greatis.net/tcpip_sys_restore.zip
Solution 8
Link to the description of the process: http://itfound.ru/85-net-seti-avast-tcpip.html
Solution 9
Duplicates the solutions described here, but contains the tcpip.sys file for Windows 7. The problem mostly affected Windows XP, but according to several users of the avast forum, there were cases of false positives on Windows 7 as well. Link to the file tcpip.sys if you can't find it on another computer or as written in solution #3: http://avast-russia.com/files/tcpiprestore/tcpipWIN7.zip
After following the steps described in the solutions to the problem, if avast again wants to delete this file, be sure to put this file in exceptions until you update your anti-virus databases to current version, which no longer contain the erroneous definition of the file as malicious.
On December 5, in the evening, my friend had an unpleasant event - the Internet stopped working, which she immediately informed me about in a phone call. It turned out that the avast! anti-virus program installed on her computer found some kind of virus and offered to immediately remove it, restart the computer and perform a full scan. The owner of the computer agreed with the proposal, not suspecting how it would turn out for her. As a result: the Internet does not work, the girl is very upset.
In order to help my friend, I decided to seek help from search engines(fortunately, I have another antivirus installed on my computer and the Internet worked fine). After a few minutes of research, it was possible to find out that the problem was becoming widespread. Its essence is this. Late in the evening on December 5, an incorrect update of the avast! Windows system XP and the aforementioned antivirus, a false positive occurred, avast! I saw a serious threat in the tcpip.sys system file and persistently offered to get rid of it. If the user agreed, then this file was deleted from the computer, then the computer was restarted and all network connections that were installed on the computer stopped working.
All solutions to this problem described on the Internet are based on restoring the tcpip.sys system file, which can be taken from the C: / Windows / system32 / dllcache folder. However, judging by the answers on the forums, this file is not always present in this folder. In general, the elimination of the above problem turns into a practically unsolvable task for the user. It is not difficult to put yourself in the place of such a user. The internet suddenly stopped working. It is clear that avast! is to blame, because after he deleted the file, the Internet stopped working. What file did he delete? Unclear! After all, they agreed with the proposal for removal neglyadya. There is a natural desire to turn to Google (Yandex or other search engines) for help, but the Internet does not work! And what to do? Ask a friend for help, which my friend did. I will describe the method that helped in our case. I downloaded system file tcpip.sys here: http://avast-russia.com/files/tcpiprestore/tcpip.zip , unzipped it, threw it on a USB flash drive and went to visit.
The file must be dropped into the system folder, which, of course, is hidden. To show hidden files in Windows XP, you need to go to the "Start" menu and select Control Panel.
In the window that opens, select "Folder Options".
Go to the "View" tab and in the advanced options select "Show hidden files and folders" and click "OK".
Now copy the tcpip.sys file to the C:/Windows/System32/drivers folder. After copying, you need to enable the tcp / ip protocol driver. To do this, right-click on the "My Computer" shortcut on the desktop and select "properties".
In the window that opens, select the "Hardware" tab and click the "Device Manager" tab.
In the window that opens, select the "View" menu, check the "Show hidden devices" box and select "Non-Plug and Play Drivers".
Right-click on "TCP/IP Protocol Driver" and select "Properties".
In the window that opens, go to the "Driver" tab. Set the startup type to "System" and click "OK".
We restart the computer. After the reboot, the ill-fated antivirus may again demand to delete the file they hate, but we, taught by bitter experience, will not agree to this now. From now on, network connections are working again and you can connect your Internet connection. After access to the Internet will appear, you will need to update avast!. Fresh updates no longer allow false positives.
I would like to mention one more method proposed directly on the site http://avast-russia.com, which helped my friends who faced the above problem. Its essence is this.
Instruction:
- Download the avastfix.zip file from a friend/comrade/relative/neighbor who has Internet access (see the link above for XP SP3) to your "flash drive"/CD-R;
- Unpack the avastfix.zip archive on a faulty computer / laptop (right-click on the file - “extract all”);
- Disable Avast: right-click on the avast icon near the clock, select "manage avast screens", then
select "switch off forever"; - Run fixtcpip.bat file, which is located inside the folder you unpacked, after that the computer will restart;
- Update Avast databases to the latest version (double-click on the avast icon near the clock, select "maintenance" - "update" - "update the scanning and virus detection engine"), enable avast: right-click on the avast icon near the clock, select "manage screens avast", then select "enable all screens".
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ATTENTION! In very rare cases, you may have an "old" operating system Windows XP installed with a second service pack( Windows XP SP2), then you need to download the file from the link: http://avast-russia.com/files/tcpiprestore/avastfixSP2.zip .
If you do not know what version of the XP SP2 or XP SP3 operating system you have, then you can find out about it from the computer properties: click Start - right-click on "My Computer" - select "properties" and it will say which one you have Service Pack - 2 or 3.
Or download from here (mirror):
Yesterday and today after the next update of the software core of the popular free antivirus Avast for many owners of computers with Windows XP SP3 completely lost the local network and Internet access. So the day was spent running around and “treating” computers for antivirus.
The symptoms are as follows if you open the connection properties - then instead of the values of the IP address, subnet mask, gateway, DNS servers, etc. just a white box. Like in the picture:
Also, the Avast icon with an exclamation mark and a message about inoperability. If PPPoE was used, error 720 was generated.
Fixing this problem is easy. To do this, follow these steps:
1. Download the file from here or from here
2. Disable Avast. It is important to choose “Forever”, we will turn it on later when it is already possible.
3. Unpack the downloaded archive.
4. Launch from there fixtcpip.bat. The computer will restart. The network and the Internet are working.
5.Important- update Avast databases, before updating do not include.
6. After updating the databases, you can turn Avast back on.
