ORA-12268
server uses weak encryption/crypto-checksumming version
Cause
Encryption/crypto-checksumming version used by server is not supported by client configuration.
Action
Upgrade the server to use strong version of the encryption and crypto-checksumming adapter. If support for weaker version is needed, add the following to sqlnet.ora file to allow connections to weak servers: sqlnet.allow_weak_crypto = true
CAUTION: This parameter allows insecure network connections between a client and server. Hence, it must not be used unless the server cannot be updated to run stronger version of the encryption and crypto-checksumming adapter. User is strongly advised to consider the implications of this parameter before configuring it to allow weak connections.