Even though the hotfix refers to WiMax connections having trouble renewing DHCP client leases, I have seen this exact behavior within network traces using my Novatel U720 USB EVDO modem that is connected to my home's Forefront TMG server. For those that don't know, Forefront Threat Management Gateway is the 'renamed' ISA Server which is part of the Forefront "Stirling" release (Forefront v.Next).
Since my Forefront TMG server is Server 2008 based, it would make sense that this hotfix should help the inconsistent/quirky behavior after maintaining a connection for 24 hours. At that point, DHCP attempts to renew and 9 times out of a 10, goes into a "coma" and stays "stuck" in the "connecting" state.
I can work around that bug by disabling the NDIS support on the U720 and using a 'normal' PPP connection, but that comes with its own set of limitations, especially if I want to do multi-ISP bonding or any of the other fancy features that being in NDIS mode enables.
If you have had trouble with Vista/Server 2008 renewing DHCP leases on WiMax/3G connections,
request and try out KB
955352.
The cause:
"This problem occurs because the Windows Vista-based DHCP client computer does not comply with RFC2131 when the client computer tries to renew an IP address that was previously used. When a DHCPNACK packet is received from the DHCP server, the client must invalidate its previous configuration for the interface. Then, the client must return to the initial state to start the renew process."