Oracle Errors

ORA-00600: internal error code, arguments...

ORA-01580: error creating backup file...

ORA-01917: user or role 'NAME' does not exist

ORA-02304: invalid object identifier literal 

ORA-03134: Connections to this server version are no longer supported

ORA-03136: WARNING Inbound Connection Timed Out

https://support.oracle.com 465043.1

ORA-08002: sequence MYSEQ.CURRVAL is not yet defined in this session

ORA-08004: sequence MYSEQ.NEXTVAL exceeds MAXVALUE and cannot be instantiated 

ORA-16766: Redo Apply is stopped

ORA-16855: transport lag has exceeded specified threshold

ORA-16724: cannot resolve gap for one or more standby databases

ORA-16857: standby disconnected from redo source for longer than specified threshold

ORA-02449: unique/primary keys in table referenced by foreign keys

ORA-24962: connect string could not be parsed, error = 303

There is a typo in one of your client tnsnames.ora files. Try to match timestamps with the listener.log to identify the correct client machine.

ORA-27054: NFS file system where the file is created or resides is not mounted with correct options

ORA-28040: No matching authentication protocol error 

ORA-28575: unable to open RPC connection to external procedure agent

ORA-28576: lost RPC connection to external procedure agent

ORA-32830: result code -101 returned by Messaging Gateway agent

ORA-32846: Messaging Gateway agent cannot be started; status is BROKEN

ORA-39082: Object type ... created with compilation warnings

ORA-39083: Object type ... failed to create with error:

Refer to accompanying errors

ORA-39346: data loss in character set conversion for object

ORA-55622: DML, ALTER and CREATE UNIQUE INDEX operations are not allowed on table...

RMAN-04006: error from auxiliary database: ORA-01017: invalid username/password; logon denied

RMAN-06091

RMAN-06820: warning: failed to archive current log at primary database

TNS-01198: Listener failed to initialize valid node list

TNS-12514: TNS:listener does not currently know of service requested in connect descriptor

TNS-12516: TNS:listener could not find available handler with matching protocol stack

This is a generic network issue where the other side of the connection has closed the connection. Could be network or other issues on the client machine.