You can use Sybase Central or a DROP SERVER statement to delete a remote server from the ISYSSERVER system table. All remote tables defined on that server must already be dropped for this action to succeed.
You must have DBA authority to delete a remote server.
Connect to the host database from Sybase Central.
Open the Remote Servers folder.
Select the remote server you want to delete, and then choose File > Delete.
Connect to the host database from Interactive SQL.
Execute a DROP SERVER statement.
For more information, see DROP SERVER statement.
The following statement drops the server named RemoteSA:
DROP SERVER RemoteSA;