ORA-12500: TNS:listener failed to start a dedicated server process
ORA-12502: TNS:listener received no CONNECT_DATA from client
ORA-12504: TNS:listener was not given the SID in CONNECT_DATA
ORA-12505: TNS:listener does not currently know of SID given in connect descriptor
ORA-12508: TNS:listener could not resolve the COMMAND given
ORA-12509: TNS:listener failed to redirect client to service handler
ORA-12510: TNS:database temporarily lacks resources to handle the request
ORA-12511: TNS:service handler found but it is not accepting connections
ORA-12513: TNS:service handler found but it has registered for a different protocol
ORA-12514: TNS:listener does not currently know of service requested in connect descriptor
ORA-12515: TNS:listener could not find a handler for this presentation
ORA-12516: TNS:listener could not find available handler with matching protocol stack
ORA-12518: TNS:listener could not hand off client connection
ORA-12519: TNS:no appropriate service handler found
ORA-12520: TNS:listener could not find available handler for requested type of server
ORA-12521: TNS:listener does not currently know of instance requested in connect descriptor
ORA-12522: TNS:listener could not find available instance with given INSTANCE_ROLE
ORA-12523: TNS:listener could not find instance appropriate for the client connection
ORA-12524: TNS:listener could not resolve HANDLER_NAME given in connect descriptor
ORA-12525: TNS:listener has not received client’s request in time allowed
ORA-12526: TNS:listener: all appropriate instances are in restricted mode
ORA-12527: TNS:listener: all instances are in restricted mode or blocking new connections
ORA-12528: TNS:listener: all appropriate instances are blocking new connections
ORA-12529: TNS:connect request rejected based on current filtering rules
ORA-12531: TNS:cannot allocate memory
ORA-12532: TNS:invalid argument
ORA-12533: TNS:illegal ADDRESS parameters
ORA-12534: TNS:operation not supported
ORA-12535: TNS:operation timed out
ORA-12536: TNS:operation would block
ORA-12537: TNS:connection closed
ORA-12538: TNS:no such protocol adapter
ORA-12539: TNS:buffer over- or under-flow
ORA-12540: TNS:internal limit restriction exceeded
ORA-12541: TNS:no listener
ORA-12542: TNS:address already in use
ORA-12543: TNS:destination host unreachable
ORA-12544: TNS:contexts have different wait/test functions
ORA-12545: Connect failed because target host or object does not exist
ORA-12546: TNS:permission denied
ORA-12547: TNS:lost contact
ORA-12548: TNS:incomplete read or write
ORA-12549: TNS:operating system resource quota exceeded
ORA-12550: TNS:syntax error
ORA-12551: TNS:missing keyword
ORA-12552: TNS:operation was interrupted
ORA-12554: TNS:current operation is still in progress
ORA-12555: TNS:permission denied
ORA-12556: TNS:no caller
ORA-12557: TNS:protocol adapter not loadable
ORA-12558: TNS:protocol adapter not loaded
ORA-12560: TNS:protocol adapter error
ORA-12561: TNS:unknown error
ORA-12562: TNS:bad global handle
ORA-12564: TNS:connection refused
ORA-12566: TNS:protocol error
ORA-12569: TNS:packet checksum failure
ORA-12570: TNS:packet reader failure
ORA-12571: TNS:packet writer failure
ORA-12574: TNS:redirection denied
ORA-12582: TNS:invalid operation
ORA-12583: TNS:no reader
ORA-12585: TNS:data truncation
ORA-12589: TNS:connection not bequeathable
ORA-12590: TNS:no I/O buffer
ORA-12591: TNS:event signal failure
ORA-12592: TNS:bad packet
ORA-12593: TNS:no registered connection
ORA-12595: TNS:no confirmation
ORA-12596: TNS:internal inconsistency
ORA-12597: TNS:connect descriptor already in use
ORA-12598: TNS:banner registration failed
ORA-12599: TNS:cryptographic checksum mismatch

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