The SYBASE environment variable must define the Sybase ASE software
installation path.
The PATH environment variable must define the access path to database
client programs.
On UNIX™, LD_LIBRARY_PATH
(or equivalent) must hold the path to the client libraries libsybct.so and
libsybcs.so. On Windows™, the path to the DLLs
must be defined in PATH.
Check the Sybase Client configuration, especially server name
definition in connection's directory source, see DSQUERY environment
variable.
Make sure the database client locale is properly defined.
You can make a connection test with the Sybase ISQL tool.