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Internet access is blocked due to malware infection, how to eliminate it?
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This tutorial describes how to re-establish Internet access if blocked by malware. Some malware variants modify Internet browser settings by adding a Proxy Server. In these cases, you will be unable to visit any websites, and thus not able to download the required software to eliminate the security infections. Other types of malware change the computer's DNS settings or add various entries to your operating system's Hosts file. By altering these settings, computer viruses can cause redirect issues or completely block the Internet connection. If you cannot access the Internet, and suspect that this is caused by a virus infection, check the settings below.
If you cannot access the Internet due to a malware infection, first try booting your computer in Safe Mode with Networking. You can find out how to do this in our 'how to remove spyware?' section. If you are still unable to access the Internet, use these instructions:
It is recommended to run a free scan with Combo Cleaner - a tool to detect viruses and malware on your computer. You will need to purchase the full version to remove infections.
Check Proxy Server settings in Internet Explorer:
1. Open Internet Explorer. At the top right corner of the main window, click the 'wrench' icon. In the opened drop down menu, choose 'Internet Options'.
2. In the opened window, select the 'Connections' tab.
3. In the 'Connections' tab, click the 'LAN settings' button.
4. In the 'Lan settings' window, ensure that the 'Use a proxy server for your LAN' option is not checked (otherwise, uncheck it and click 'OK').
Check your computer's DNS settings:
1. Click the 'Windows logo' (Start button).
2. In the opened menu, select 'Control Panel'.
3. In the opened window, click 'Network and Internet'.
4. In the opened window, click 'View network status and stats'.
5. Click 'Local Area Connection'.
6. In the opened window, click the 'Properties' button.
7. In the 'Properties' window, select 'Internet Protocol (TCP/IP)' and click the 'Properties' button.
8. In the opened window, check if 'Obtain DNS server address automatically' is checked.
Check your operating system's Hosts file.
Locate your Hosts file. You should find it at %systemroot% system32driversetc (commonly, it will be c:windowssystem32driversetc). Open the Hosts file with Notepad and verify that no unusual values have been added to it.
These are the default values, and yours should be the same:
Default Windows XP Hosts File:
# Copyright (c) 1993-1999 Microsoft Corp.
#
# This is a sample HOSTS file used by Microsoft TCP/IP for Windows.
#
# This file contains the mappings of IP addresses to host names. Each
# entry should be kept on an individual line. The IP address should
# be placed in the first column followed by the corresponding host name.
# The IP address and the host name should be separated by at least one
# space.
#
# Additionally, comments (such as these) may be inserted on individual
# lines or following the machine name denoted by a '#' symbol.
#
127.0.0.1 localhost
Default Windows Vista Hosts File:
# Copyright (c) 1993-2006 Microsoft Corp.
#
# This is a sample HOSTS file used by Microsoft TCP/IP for Windows.
#
# This file contains the mappings of IP addresses to host names. Each
# entry should be kept on an individual line. The IP address should
# be placed in the first column followed by the corresponding host name.
# The IP address and the host name should be separated by at least one
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# space.
#
# Additionally, comments (such as these) may be inserted on individual
# lines or following the machine name denoted by a '#' symbol.
#
127.0.0.1 localhost
::1 localhost
Default Windows 7 Hosts File:
# Copyright (c) 1993-2006 Microsoft Corp.
#
# This is a sample HOSTS file used by Microsoft TCP/IP for Windows.
#
# This file contains the mappings of IP addresses to host names. Each
# entry should be kept on an individual line. The IP address should
# be placed in the first column followed by the corresponding host name.
# The IP address and the host name should be separated by at least one
# space.
#
# Additionally, comments (such as these) may be inserted on individual
# lines or following the machine name denoted by a '#' symbol.
#
# localhost name resolution is handle within DNS itself.
# 127.0.0.1 localhost
# ::1 localhost
After checking and correcting these settings, your Internet connection should be back to normal. If you are dealing with malware infections, we recommend downloading anti-spyware software from our Top Anti-Spyware programs list and running a full system scan.
Hi,
I got the internet to reconnect but my chrome browser stalls while loading any website completely.
E.g. it shows empty thimbnails if I open YouTube or just the top search bar and adjacent links on Facebook.
What say? Should I try resetting chrome to default or reinstall it? Am I missing something?
Please please help me I’ve tried everything but not only is this malware preventing me from accessing internet it’s also not allowing me to even search from the start up button please help
Those are just examples writtten there by microsoft in newer versions of windows. Lines beginning with '#' are comments and do not affect anything. You can write anything in the comments.
Thanks a lot, it fix my problem. Its block my computer and phone to access internet. After editing my host, i can Access Internet!
I runned as administrator and tried to save the updated hosts file. But it doesn't let me save as it says: it is running by other processes. But I don't see it is open anywhere else. I appreciate if somone helps me. Thanks
nvm about that line though, Removed it. Still didn't work .-.
This is an extra line in my hosts
#
# For example:
#
# 102.54.94.97 rhino.acme.com # source server
# 38.25.63.10 x.acme.com # x client host
Should I remove it? . -.?
Sorry, I use win10.
In my issue is wifi connected, internet access but laptop internet disable, when I view network status and tasks, it's say 'you are currently not connected to any networks' so I can't see my IP address also my DNS . Help me
This happened to me before and since I am not a techie person, I decided to use antivirus software. (ESET Antivirus, Avast etc) and its much easier and better. Thanks for sharing these tips anyway.
Well, these settings are very helpful for the users to protect their computer from viruses.
thanks for the tutorial. Some AV (Eg. ESET Antivirus) has an interface that would allow you to customized your block sites list. It could be helpful to some users who dont know much about commands. But this is good also. Thanks
I love the article. I didnt know that malwares such as this could exists. The only protection I have in my pc is ESET Antivirus. The services are good as I dont detect and experience this problem. No threats has been infecting my PC since I installed it.But Im glad I came across your blog and I know what to do in any case that I have encountered this.
It can also be proxy under tcp/pv4 as it was for me on win7
How did you get past the saving it as admin, I tried running as admin but still won't let me save it. Gives me option to save to documents instead.
Thank you so much,having taken my pc to repair centre over this issue,I withdrew it after reading this and at that point in time the guy had failed to figure it out.i followed your easy steps.i also installed and run the follow free tools Junk file remover ,hitman pro ,.adwcleaner.bam I am back online...I would buy you a drink or two.god bless.
Im on windows 8.1, i did all the steps above, i installed bunch of antivirus and antimalware programs but my browser keeps betraying me. Im using adblock, and some of the page which DID loads would have an absurd amount of ads (like 290 ads) blocked by adblocker. Any alternative solution for me? Thanks.
Hi it worked for me. I had Host file populated with values. Now internet browsers r working fine!
Um.. this is what I have:
# Copyright (c) 1993-2009 Microsoft Corp.
#
# This is a sample HOSTS file used by Microsoft TCP/IP for Windows.
#
# This file contains the mappings of IP addresses to host names. Each
# entry should be kept on an individual line. The IP address should
# be placed in the first column followed by the corresponding host name.
# The IP address and the host name should be separated by at least one
# space.
#
# Additionally, comments (such as these) may be inserted on individual
# lines or following the machine name denoted by a '#' symbol.
#
# For example:
#
# 102.54.94.97 rhino.acme.com # source server
# 38.25.63.10 x.acme.com # x client host
# localhost name resolution is handled within DNS itself.
# 127.0.0.1 localhost
# ::1 localhost
Check this video I made very detailed https://youtu.be/bsvD9RsZEGU
For those that can not open host file with notepad are save changes you need to right click the host file go into properties then change file permissionsize make sure you have full control of the file then it should allow you to edit it and save changes
Natalie, I got the same thing. But went to Microsoft's site, and apparently those characters belong there. I was puzzled for a minute as well.
Ok So I found some extra text in my host file:
# For example:
# 102.54.94.97 rhino(dot)acme(dot)com # source server
# 38.25.63.10 x(dot)acme(dot)com # x client host
Now I want to delete this text but my computer will not let me open it??? I was able to browse and open with notepad. But Is it ok for me to save it as a notepad file and put it back in the folder?
I am logged in as an admisitrator
Now I also need to mention that I have run these programs: ( Malware Bytes, Spy Hunter, AVG, Hitmanpro, Adwcleaner, CC Cleaner) Malware Bytes caught the Pum files and trojan horse and it quarantined them but the next day around the same time, I had the same problem again. I noticed that is made the google chrome icon disappear to a File like picture. None of my internet browsers worked. Only after Every day I had to quarantine this virus, I restarted the computer it it stays gone for 24 hours.
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Viruses/Malware IT CAUGHT:
Pum.Bad.Proxy (Registry)
Trogan.Agent (File)
I tried posting yesterday but it never made it.. I have tried all of the steps listed, multiple different malware and virus removers, and other similar websites with slightly different ideas for removing this stuff. I've even tried safe mode with networking and run all of the same things. I know it is not the network itself as that was the first thing I tried. I have had ZERO luck in getting rid of it still. Anyone have any ideas? Please help.
I have tried every step listed here including running full system scans with AVG, Microsoft Essentials, Malwarebytes and then some from other similar sites with slight variations to remove it, but no luck for me. I still have a major block not letting me connect my desktop and it is surely not the internet connection itself. The old unused laptop has surely come in handy, but I need my desktop back! Anyone have any other ideas? I'm just about to chuck the machine and salvage the HDD. I have spent over 9 hours trying everything
Hi, after following your advice and opening it after logging in as an administrator, the hosts file doesn't show up anymore? After system 32-drive-etc it says no items match your search so I am unable to change anything/ save the file. Please help :(