Jeff, i will assume you are using Windows.
Create a batch file in your STARTUP folder, lets call it dns_pswd.bat, to contain the following line:
net use \\192.168.1.240 ppppp /user:uuuuuuu
ppppp is your password, uuuuuuu is your user name, and the 192.168.1.240 (true in my config) is the ip address of your dns-321.
After a reboot, or if you just execute the bat file, .... That should fix it for you, except then it will NEVER ask for the password, and always know what is supposed to be.
Good luck.
Tinus