Wondering how to fix the ‘DHCP error 0x79’? We can help you with it.

Here at Bobcares, we have seen several such DHCP-related errors as part of our Server Management Services for web hosts and online service providers.

Today we will take a look at the causes for this error and see how to fix it.

Reasons for DHCP error 0x79 to occur

Before we get into the solution part of this error, let’s see the reasons for this error to occur.

• This error indicates that you have a predefined IP address on the computer and your device has assigned this IP address to some other device.
• The IP address is beyond the scope of the DHCP range.

For instance, the error appears as below.

How we fix DHCP error 0x79

Now let’s see the solution our Support Engineers provide to our customers to get rid of this error message.

1. First, make sure to check the DHCP range on the router. Also, verify that the computer is set to obtain an address automatically.

2. Try to disable the Internet Protocol Version 6 (IPv6) on the network adapter. Here are the steps for doing it.

• First, right-click on the Network icon in the System Tray and click on Network and Sharing Center.
• Next, click on Change Adapter Settings.
• After that, right-click on Network Adapter and Choose ‘Properties’.
• Then uncheck “Internet Protocol Version 6”.
• Finally, click on OK.

3. Try unplugging the LAN cable and wireless connection

• First, go to “Ethernet Adapter local area connection 2” properties.
• Next, select the “Internet Protocol Version 4 (TCP/IPv4)”.
• Now click on the Properties button.
• Then, select the “Use the following IP address:” option and set the below IPs
  IP=192.1xx.1.10
  subnet mask=255.255.255.0
  default gateway = your router IP address such as 192.1xx.1.1
• After that, from the second section, select “Use the following DNS server addresses:”
  set “PreferAlternate DNS server:” your router default IP for example 192.168.1.1
• Finally, click on OK and try to connect through the LAN and then wireless.

4. You can also try disabling Wireless Connection #2 (Microsoft Virtual WiFi Miniport Adaptor) network adapter. You can find this by comparing the MAC address listed in the error message with the output of CMD>ipconfig /all.

5. Also, check the DHCP “lease” time of the router and make sure it is set as high as it can go.

6. services.mscLocate the DHCP Client service, so make sure that it is Started and the Startup Type is set to Automatic. In case, if the service is already Started then try to stop it and restart it.

7. Click on Start >> Programs >> Accessories >> right-click on Command Prompt, select “Run as Administrator” to open a command prompt.
Then in the Command Prompt, execute the following commands one after the other.

#Reset WINSOCK entries to installation defaults:

netsh winsock reset catalog

# Reset IPv4 TCP/IP stack to installation defaults:

netsh int ipv4 reset reset.log

# Reset IPv6 TCP/IP stack to installation defaults:

netsh int ipv6 reset reset.log

Finally, reboot the computer.

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Conclusion

In short, this error indicates that you have a predefined IP address on the computer and your device has assigned this IP address to some other device. Today, we saw the solution provided by our Support Engineers to this error.