How to Fix Internet Access Problem Caused by Malware?

Your computer may have been attacked by a virus. Sometimes, a malicious program may change the browsers settings by adding a Proxy Server Proxy Server. As a result, you are prevented from removing this virus through finding a way on the internet. In addition, some other types of virus may change DNS settings or add various entries to your operating system’s HOSTS file. So, the key point to fix the internet access problem is to change Proxy Server settings, DNS settings and HOSTS file back. This article shows instructions of fixing internet access issues.
 

step 1

Check Proxy Server settings in Internet Explorer

 
1 Launch the Internet Explore, go to Tools (gear icon), and click on Internet Options.
 

 
2. In the opened window select Connections tab and hit LAN settings.
 

 
3 LAN settings window opens, unchecked proxy server and click OK.
 

 

step 2

Check the DNS settings

 
1 Go to start button, click control panel, type adapter in the search box, and then, hit Network and Sharing Center.
 

 
Note: If you’re prompted for an administrator password or confirmation, type the password or provide confirmation.
 
2 Right-click the connection that you want to change, and then click Properties.
 

 

 
3 Click the Networking tab. Click either Internet Protocol Version 4 (TCP/IPv4) or Internet Protocol Version 6 (TCP/IPv6), and then click Properties.
 
IPv4 IP address settings
 

 
Choose one of the following:
 
A. Click Obtain an IP address automatically, and then click OK.
 

 
B. Click Use the following IP address, and then, in the IP address, Subnet mask, and Default gateway boxes, type the IP address settings.
 

 
C. Click Use the following DNS server addresses, and then, in the Preferred DNS server and Alternate DNS server boxes, type the addresses of the primary and secondary DNS servers.
 

 
IPv6 IP address settings
 

 
Choose one of the following:
 
A. Click Obtain an IP address automatically, and then click OK.
 

 
B. Click Use the following IP address, and then, in the IP address, Subnet mask, and Default gateway boxes, type the IP address settings.
 

 
C. Click Use the following DNS server addresses, and then, in the Preferred DNS server and Alternate DNS server boxes, type the addresses of the primary and secondary DNS servers.
 

 

step 3

Check your operating system’s HOSTS file

 
Go to start, type c:\windows\system32\drivers\etc (%systemroot%\system32\drivers\etc for window 2000/ XP), open etc file, you can’t miss the hosts file.
 
These are the default values. Yours should be the same.
 
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

 
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
# 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

 
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
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