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Windows 7: DHCP client tries to aquire an IP for not connected network cards

25 Oct 2011   #1

Windows 7 profesional 64bits
DHCP client tries to aquire an IP for not connected network cards


I have a problem with a Windows 7 64 bits. After power on, the DHCP client tries to acquire an IP for all the network cards, even those that are not connected.
I can see in the event logs that after 2 minutes from the startup, I get one message for each interface
Your computer was not assigned an address from the network (by the DHCP Server) for the Network Card with network address 0xMAC_ADDRESS. The following error occurred: 0x79. Your computer will continue to try and obtain an address on its own from the network address (DHCP) server."
I have an Astaro VPN client that manifests itself as a network card and when I start it up (manually) it fails to receive an IP from the DHCP server. I believe it is related with this general DHCP problem because if I start it up within two minutes from power on (before I get the message in the event log), then it works.

Any idea how to debug this problem?
I had a Dell connection manager which I uninstalled (thinking it will solve the problem), maybe this one left some bad traces. Any idea how to find and remove them?
In general, how would one know all the programs that are dealing/interfering with the network connections and dhcp settings?

My System SpecsSystem Spec
26 Oct 2011   #2
Dave Atkin

Windows 7 Ultimate x64

See the following:

DHCPv6-client....Errors in event viewer.

That may help.

My System SpecsSystem Spec

 DHCP client tries to aquire an IP for not connected network cards

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