accessing folder on server belonging to another domain

[Charles MacLean]

I have a VISTA Ultimate machine that belongs to Domain X where I have my
account. I want to access (read/write) files on Domain Controller Y. Both
machines are on the same segment on our LAN. Both the DC X that I belong to
and DC Y are Server 2003 R2 machines. I seem to able to read and write files
after a fresh boot of my machine but then things seem to go sour after an
hour or so. My program can't write to DC Y. Any suggestions?

Thanks

 

[Charles MacLean]

I've already mapped the drive on the foreign domain's DC drive1 (Domain Y)
as persistant. I also have a drive mapped on my DC's drive1 (domain X) that
never refuses me access. After the drive on DC Y refuses me access within
the program I wrote I tryed to access it via the network folder. When I
click on the DC icon I'm prompted for user ID/password only to be denied
access even when I enter the administrator's user name and password. We also
have a XP Pro WS that is running the same program that accesses the server
DC Y that experiences the same problem but to a lesser extent. This is very
perplexing. Any more ideas?

Thanks,
Charles