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wireless signal is strong but no internet connection

Lenovo netbook with Windows 7 has strong wireless signal but will not connect to any site using Firefox and IE. Wireless Network Connection Status shows. Windows diagnosis cannot find any problem.
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Pedicode1
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Pedicode1
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1 Solution
 
John HurstBusiness Consultant (Owner)Commented:
Open a command prompt and see if you can ping 4.2.2.2 (DNS server). Make sure you do not have IE or Firefox set to use a Proxy Server. Make sure there are no entries except for comments (#) in your Hosts file (c:\windows\system32\drivers\etc)


.... Thinkpads_User
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Brian GeeCommented:
If using a wireless router, try connecting physically (Ethernet) to the router to see if Internet works that way or not. If not, then the wireless router may be working fine but a configuration or other issue may be culpable to the Internet connectivity issue itself...
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Pedicode1Author Commented:
Thinkpads_User
cannot ping 4.2.2.2
Packets sent = 4, Received = 0, Lost = 4 (100% loss)
not sure how to check for entries in hosts file
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Brian GeeCommented:
<<not sure how to check for entries in hosts file>>

C:\Windows\System32\drivers\etc

Open the hosts file with a program like Notepad.
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Pedicode1Author Commented:
Yobri
 Plugged (Ethernet) cable in, shows wired icon connection in tray. Still "server not found" shows up on I.E.
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Brian GeeCommented:
Is this a home (consumer grade) router like Linksys, Netgear, D-Link, etc.?
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John HurstBusiness Consultant (Owner)Commented:
Try doing a hardware reset on your router, then check and see first if wired connection works.

... Thinkpads_User
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Pedicode1Author Commented:
Four host files found in that path:

hosts
lmhosts.sam
networks
protocol
services

in the networks file, the last word is
loopback   127  (this line does not have the # sign)

in the protocol file,
ip      0     IP     # Internet Protocol
icmp 1    ICMP # Internet control Message
(there are about 20 entries with assigned numbers that does not start with the # sign)

in the services file, there are number of lined entries without the # sign.

all other file entries starts with the # sign
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John HurstBusiness Consultant (Owner)Commented:
So you only have one hosts file (the others are different filenames).

So in your hosts file, the loopback (uncommented) is certainly blocking your connection. Make sure each entry in hosts has a comment (#).  .... Thinkpads_User
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Pedicode1Author Commented:
It is a computer lab with ten netbooks. Nine can access the wireless router and have internet connection. This one shows full signal but no internet connection.
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John HurstBusiness Consultant (Owner)Commented:
I made an error above. Your networks file can have that line.

Let's deal only with the HOSTS file (the others are not hosts files). If all the lines in the HOSTS file are commented, then it is probably OK.

Take a look at this Microsoft Article to reset TCP/IP and see if it helps. Follow it carefully.

... Thinkpads_User

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balasundaram_sCommented:
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John HurstBusiness Consultant (Owner)Commented:
The internal firewall has never stopped me from a basic ping, but do let us know if that makes a difference.

And I made another error in that I did not past the link for TCP/IP Repair. Sorry.
http://support.microsoft.com/kb/299357

.... Thinkpads_User
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Pedicode1Author Commented:
thanks it's fixed.
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John HurstBusiness Consultant (Owner)Commented:
Thank you. I was happy to help. Long post for the little things, but I am happy TCP/IP repair worked.

.... Thinkpads_User
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