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What could be blocking my network adapters from getting a DHCP address?

Posted on 2014-11-14
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Last Modified: 2014-11-19
I have a computer that can connect and authenticate to my wireless network, but both wired and wireless cannot get a DHCP address.  I can manually set the IP, but it still will not cannot ping an ip address on the network.  It returns a general failure error when pinging an IP.
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Question by:NachiPhil
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Expert Comment

by:John Hurst
ID: 40443285
Try running TCP/IP Reset to see if fixing the IP stack repairs the issue.

Open cmd.exe with Run as Administrator
Then  netsh int ip reset c:\resetlog.txt
Also, ipconfig /flushdns followed by net stop dnscache followed by net start dnscache
Then restart the computer

Please let use know.
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Expert Comment

by:aadih
ID: 40443323
Excellent suggestion above by John.

You may also try:

(1) Turn your PC off.

(2) Reset your router: Turn your router off for a minute and turn it on again.

(3) Turn your PC on.

If the above does not work, try:

(1) Disabling your network adapter and enabling it again.

(2) Updating your drivers: (a) Network adapter and (b) Router firmware.
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Author Comment

by:NachiPhil
ID: 40443351
Did not help.  Further info is that both network adapters work under safe mode with networking.
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Expert Comment

by:John Hurst
ID: 40443361
This means the machine is not well.

Try running System File Checker. Run SFC /SCANNOW from an admin command prompt. Run it twice, restart and test.

Is this Windows 7?  You may need to run a Repair Install. See this Seven Forums tutorial for assistance.

http://www.sevenforums.com/tutorials/3413-repair-install.html
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Expert Comment

by:aadih
ID: 40443363
When did the problem start?  A day or two?

If so, please restore your PC to an earlier time.  The best approach is to boot up in safe mode with command prompt and type rstrui.exe to restore.
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Accepted Solution

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NachiPhil earned 0 total points
ID: 40443412
Thanks for your help.  Looks like it was a corrupt Norton Internet Security installation.  The firewall was blocking everything.  I uninstalled the software and now it works.
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Expert Comment

by:aadih
ID: 40443420
Great,  :-)
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Author Closing Comment

by:NachiPhil
ID: 40451919
Fixed my own problem.
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PRTG Network Monitor: Intuitive Network Monitoring

Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

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