How to initialize domain with windows API

[Carolina Bruzzoni]

Hi,
We are having some problems on a workstation where we run a GINA 
replacement and do 802.1x authentication on user logon, this means that 
the network is not available when nobody is logged in the computer. 
After the network becomes available, we try to log the user into the 
domain and we get a "Unknown user name or bad password" error. If we 
wait for one minute the logon works ok.
We did a series of packet captures and found out that during that time 
some kind of initialization with the domain is done (which normally is 
done when computer boots). We'd like to know if it is possible to 
reproduce this behaviour using the windows API, in order not to have to 
wait for a minute after each logon. Can anyone give us a tip on where to 
look?

Thanks in advance,
Carolina Bruzzoni