help pls fast - long user names as homes not accessable

[ISM Kolemanov, Ivan]

I have need of long users names, it looks big problem 
I use the samba-tng 2.6 as PDC
the homes share for a user like "teacher1fteacher1" is not accessible 
the windows NT machine when trying to access this share 
results in the error with network path not found... 
but if I'm domain administrator I can access this share

Is there a way to get around this? 
Is the same problem appears in samba-tng 2.5.x,
2.6 is my first try with TNG

10x in advance,
Ivan Kolemanov