You may also get an error like this: For example, if you have a static IP address, then renewing will never work.
Luckily, you can read my post from Online Tech Tips on how to repair Winsock errors in Windows.
However, that may not be the only reason why an ipconfig /renew would not work.
The quick answer here is that the DHCP server itself needs to know its own IP address before it can start serving requests.
Other possibilities are network routers, and central authentication servers (a Domain Controller in the Active Directory world of Windows, or an LDAP server in the UNIX/Linux world).
Disable any firewall software and remove or disable programs like Zone Alarm and Norton Internet Security as they can get in the way sometimes.
Finally, the problem of not being able to renew your IP address could be because of the network interface card (NIC) itself.
Right-click on the Local Area Connection or Ethernet and choose Properties.
On the General tab, scroll down in the list box till you see Internet Protocol Version 4 (TCP/IPv4) and highlight it. Now make sure that both Obtain an IP address automatically and Obtain DNS server address automatically are selected.
Recently, I was working on a clients machine and after logging in, I realized that for some reason I was not able to connect to the server.
I went to the command prompt, typed in IPCONFIG and pressed Enter.