We have an issue at one of our remote sites where our client PC's can't get a connection for a delayed period of time, after a restart, or if they shutdown and boot up within 5 minutes. For some reason it takes about 3-4 minutes to get a successful session running over the wireless network. If they start up fresh of a morning, or if they shutdown and leave it for a period of time over about 5 minutes, they log in fine straight away. Our client PC's are set to boot up and log onto our domain with a set account depending on the Asset, with no user interaction. So the problem arises that when they restart one of the PC's for whatever reason, it tries to log onto the domain, but it doesn't yet have a connection (DHCP Address) so it ends up logging onto the domain with cached credentials. They don't run the normal security checks, then it sits at the desktop trying to acquire a network address and the applications the users need to access aren't available, for that 3-4 minute period.
A bit of background on our setup for this site follows:
Local Site controller is a Cisco 4402 running SV: 220.127.116.11
We're using MAC Filtering, registering against an ACS running 18.104.22.168 (patch 22.214.171.124.7)
The clients have a certificate loaded to check against ACS
The computer is checked against AD
The logon credentials are also checked with AD via the ACS