ISQL error on Sybase (Solman 7.1)

I have installed SAP Solman 7.1 on the Sybase DB , When i first time try to login to Sybase DB with SAPSA user , i am getting below error.

Msg 1640, Level 16, State 2:

Server 'SID':

Adaptive Server requires encryption of the login password on the network.

Msg 4002, Level 14, State 1:

Server 'SID':

Login failed.

CT-LIBRARY error:

ct_connect(): protocol specific layer: external error: The attempt to connect to the server failed

Please can you help , it is very urgent issue to be solved..

Thanks

Prasanna