We r trying to connect from Perl to oracle8i using DBI. It worked fine before using the sqlnet.ora with encryption. After enabling the encryption , its giving the following error ORA-12649: Unknown encryption or data integrity algorithm (DBD ERROR: OCIServer8 Couldn't log onto Oracle and the versions r as follows. Oracle: 8.1.7.4.0 Perl: version 5.005_03 built for sun4-solaris DBI : DBI.pm,v 10.10 Tnsping and Sqlplus are working fine. Contents of sqlnet.ora as follows. #===================================== # File : sqlnet.ora # Purpose: Minimal needed sqlnet.ora #====================================== NAMES.DIRECTORY_PATH= (HOSTNAME,TNSNAMES) AUTOMATIC_IPC = OFF # RC 19-APR-2003 because of WebLogic hangovers #TRACE_LEVEL_CLIENT = OFF trace_level_client=16 trace_level_server=16 SQLNET.EXPIRE_TIME = 0 sqlnet.encryption_server=requested sqlnet.encryption_types_server=(RC4_128) sqlnet.crypto_seed="fkdsjfdsjfiowewekjfkjsdkjsdkdsjsdk1234567890" sqlnet.encryption_client=accepted sqlnet.encryption_types_client=(RC4_128)