Dhcp-Client Warning

By mderevnin ·
Hello TechRepublic. I recently started to get warnings pop up in the Windows Event Viewer which causes me to have a mini disconnects multiple times a day.

I am using Windows 7 SP1 64 bit (if it matters).

The warning is as follows:
Level: Warning
Source: Dhcp-Client
Event I 1003
Task Category: Address Configuration State Event
General: Your computer was not able to renew its address from the network (from the DHCP Server) for the Network Card with network address 0xLAN_MAC_HERE. The following error occurred: 0x79. Your computer will continue to try and obtain an address on its own from the network address (DHCP) server.

Every time I get this warning, exactly 30 minutes after it I disconnect for a few seconds. Then generally exactly 1 hour after I get the originally warning, I may get another one, in which exactly 30 minutes after that I disconnect again. It doesn't happen all the time, but when it starts happening it generally happens for at least a few times in a row.

I tried disabling IPv6 and swapping out my ethernet cable.

The error started about 3 weeks ago roughly (before that I never had this issue). After about 2 weeks of having the issue and being unable to solve it, I formatted my computer. After formatting my computer the problem disappeared completely for about 5 days, and so far has been reappearing for the last 2 days.

I thought It was my router or something else causing it but my brother's computer never gets this problem (and I never used to).

Does anyone have any ideas what could be causing it? I haven't installed anything in the last few days as well. I basically installed everything on the first or second day after formatting.

Sorry for the wall of text, and thanks for looking.

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Power management, personal firewall

by robo_dev In reply to Dhcp-Client Warning

Power management:

there is a setting that says 'allow windows to reduce power to this device to save power' (or something like that). Is this a laptop?

Sometimes that adapter goes to sleep, and that hoses the LAN connection.

Personal Firewall:

The way DHCP works, is you have a lease time for the address, let's say for example it's a one-hour lease set in the server (probably the server is your router/firewall in this case).

At exactly the half-time mark, thirty minutes for this example, the DHCP server (your router firewall) sends a ping to the IP it handed out, and if it gets a reply, you keep the address.

If it gets no reply, it releases the IP address and then waits for the workstation to request a new address.

So IF, for some reason, the router either cannot reach the device (it's asleep) or if it cannot Ping it (personal firewall blocking pings), then the DHCP server will drop the link and release the address.

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