Hmmm ...

I'm assuming you built DBD::Sybase on top of the Sybase Open Client libs. Looking at the the header files, the maximum length of a password is 30 -- from cstypes.h:

/*
** The maximum password length allowed.
*/
#define CS_MAX_PASS     (CS_INT)(30)
[download]

The freetds library has some comments about fixing this restriction so you could re-build DBD::Sybase on top of the freetds libraries instead. But on all things perl and Sybase, I would follow whatever mpeppler advises.

-derby