SYBASE : ISQL login error

Hi Experts,

I am not able to login isql in command prompt . and I'm getting the following error,Can anybody help me in fixing this issue. Is there any default password for it .

I logged in as syb[sid] and exeuted below command and end up with below error :

E:\sybase\EGS\OCS-15_0\bin>isql -S EGS -U sa

Password:

Msg 4002, Level 14, State 1:

Server 'EGS':

Login failed.

CT-LIBRARY error:

        ct_connect(): protocol specific layer: external error: The attempt to co

nnect to the server failed.

E:\sybase\EGS\ASE-15_0\bin>isql -S SOLMAN -U sybegs

Password:

CT-LIBRARY error:

        ct_connect(): directory service layer: internal directory control layer

error: Requested server name not found.

Thanks In Advance,

Satheesh E