Sybase 连接数据库错误

密码错误：

Password:
Msg 4002, Level 14, State 1:
Server 'DEVELOP':
Login failed.
CT-LIBRARY error:
ct_connect(): protocol specific layer: external error: The attempt to connect to the server failed.

用户名错误：
Password:
Msg 4002, Level 14, State 1:
Server 'DEVELOP':
Login failed.
CT-LIBRARY error:
ct_connect(): protocol specific layer: external error: The attempt to connect to the server failed.

服务名错误：
Password:
CT-LIBRARY error:
ct_connect(): directory service layer: internal directory control layer error: Requested server name not found.