10000 user cancelled a dialog or progress.
10001 unimplemented Internet command.
10002 invalid array type.
10003 no more (TCP,SMTP,POP3, etc. ) references available.
10004 invalid reference.
10005 need a "Host" for use in the "SMTP_Send" command.
10006 need a "From" for use in the "SMTP_Send" command.
10007 need a recipient for use in the "SMTP_Send" command.
10008 already logged in.
10009 error trying to make a POP3 connection.
10010 error with POP3 USER.
10011 error with POP3 PASS.
10012 error with POP3 QUIT.
10013 error with POP3 STAT.
10014 error with POP3 LIST.
10015 error with POP3 UIDL.
10016 error with POP3 DELE.
10017 error with POP3 RSET.
10018 invalid message number.
10019 invalid character offset.
10020 invalid character length.
10021 error with POP3 RETR.
10022 field was not found in mail Header.
10023 no attachments found.
10024 error in processing BinHex.
10025 BinHex checksum error.
10026 Internet commands unavailable. Probably because MacTCP is not installed
10027 Connection no longer exists
10028 Exceeded 32k limit
10029 Error with POP3 NOOP
10030 POP3 session was closed by the server
10031 Error with POP3 APOP
10032 Unknown or invalid response.
10033 SMTP 421 - Service not available, closing transmission channel.
10034 SMTP 450 - Requested mail action not taken: mailbox unavailable.
10035 SMTP 451 - Requested action aborted: local error in processing.
10036 SMTP 452 - Requested action not taken: insufficient system storage.
10037 SMTP 500 - Syntax error, command unrecognized.
10038 SMTP 501 - Syntax error in parameters or arguments.
10039 SMTP 502 - Command not implemented.
10040 SMTP 503 - Bad sequence of commands.
10041 SMTP 504 - Command parameter not implemented.
10042 SMTP 550 - Requested action not taken: mailbox unavailable.
10043 SMTP 551 - User not local; please try .
10044 SMTP 552 - Requested mail action aborted: exceeded storage allocation.
10045 SMTP 553 - Requested action not taken: mailbox name not allowed.
10046 SMTP 554 - Transaction failed.
10047 FTP 421 - Service not available, closing control connection.
10048 FTP 425 - Can't open data connection.
10049 FTP 426 - Connection closed; transfer aborted.
10050 FTP 450 - Requested file action not taken. File unavailable (e.g.,file busy).
10051 FTP 451 - Requested action aborted: local error in processing.
10052 FTP 452 - Requested action not taken. Insufficient storage space in system.
10053 FTP 500 - Syntax error, command unrecognized.
10054 FTP 501 - Syntax error in parameters or arguments.
10055 FTP 502 - Command not implemented.
10056 FTP 503 - Bad sequence of commands.
10057 FTP 504 - Command not implemented for that parameter.
10058 FTP 530 - Not logged in.
10059 FTP 532 - Need account for storing files.
10060 FTP 550 - Requested action not taken. File unavailable (e.g., file not found, no access).
10061 FTP 551 - Requested action aborted: page type unknown.
10062 FTP 552 - Requested file action aborted. Exceeded storage allocation (for current directory or dataset).
10063 FTP 553 - Requested action not taken. File name not allowed.
10064 No response has been received within the given timeout period.
10065 Not an FTP file.
10066 Error in processing Base64.
10067 Error in processing AppleSingle.
10068 Error in processing Quoted-Printable.
10069 FTP session was closed by the server.
10070 Not an FTP directory.
10071 TCP session was closed by the server
10072 Invalid encode kind
10073 Invalid decode kind
10074 An asynchronous DNR call did not complete
10075 An asynchronous OpenTransport call did not complete
10076 OpenTransport bind failed
10077 OpenTransport connect failed
10078 Maximum MacTCP streams reached
10079 Error in processing uuencode
10080 Cannot load ICMP library
10081 Error in processing MacBinary
10082 MacBinary checksum error
10083 Could not open a file
10084 No FTP information received
10085 Unknown FTP information received
10086 Proxy connection failed
10087 Standard file I/O error
10088 FTP reentrant error
10089 SLI.DLL is not loaded
10091 Error trying to make an IMAP connection
10092 A maibox is not selected
10093 Invalid message part
10094 Error with IMAP LOGIN
10095 Error with IMAP LOGOUT
10096 Error with IMAP CAPABILITY
10097 Error with IMAP SELECT
10098 Error with IMAP FETCH
10099 Error with IMAP PARTIAL
10100 Error with IMAP STORE
10101 Error with IMAP EXPUNGE
10102 Error with IMAP SEARCH
10103 Error with IMAP COPY
10104 Error with IMAP CREATE
10105 Error with IMAP DELETE
10106 Error with IMAP RENAME
10107 Error with IMAP SUBSCRIBE
10108 Error with IMAP UNSUBSCRIBE
10109 Error with IMAP LIST
10110 Error with IMAP LSUB
10111 Error with IMAP STATUS
10112 Error with IMAP CLOSE
10113 Error with AUTHENTICATION- Uncheck authentication

BSD Error Codes

1 Operation not permitted
4 Interrupted system call
13 Permission denied
14 Bad address
22 Invalid argument- the smtp address is not correct
24 Too many open files
35 Operation would block
36 Operation now in progress
37 Operation already in progress
38 Socket operation on non-socket
39 Destination address required
40 Message too long
41 Protocol wrong type for socket
42 Protocol not available
43 Protocol not supported
44 Socket type not supported
45 Operation not supported
46 Protocol family not supported
47 Address family not supported by protocol family
48 Address already in use
49 Can't assign requested address
50 Network is down
51 Network is unreachable
52 Network dropped connection on reset
53 Software caused connection abort
54 Connection reset by peer
55 No buffer space available
56 Socket is already connected
57 Socket is not connected
58 Can't send after socket shutdown
60 Operation timed out
61 Connection refused

WinSock Error Codes

-10004 Blocking call cancelled
-10013 Permission denied
-10014 Bad address
-10022 Invalid argument
-10024 No more sockets available
-10035 Non-blocking socket would block
-10036 Illegal WinSock function invoked while a blocking function is in progress
-10037 An attempt was made to cancel an asynchronous operation that has already completed
-10038 Specified socket descriptor is not valid for this application
-10039 Destination address was required but none was supplied to the function
-10040 Datagram too large for buffer
-10041 Specified protocol does not match the other parameters in the call
-10042 Protocol option is unknown or invalid
-10043 Specified protocol is not supported by the Windows Sockets implementation
-10044 Specified socket type is not supported by the specified address family
-10045 Socket does not support the specified operation
-10046 Protocol family not supported
-10047 Specified address family is not supported by the Windows Sockets implementation or cannot be used with the indicated socket
-10048 Specified address is already in use
-10049 Specified address is not available from the local machine
-10050 Problem with the network subsystem
-10051 Network cannot be reached from this host at this time
-10052 Connection was dropped and must be reset
-10053 Connection was aborted because of a timeout or other error condition
-10054 Connection was reset by the remote host
-10055 Windows Sockets implementation is out of buffer space or the space provided in an API call by the application was too small to hold the requested information
-10056 Specified socket is already connected
-10057 Specified socket is not connected
-10058 Socket has had the requested functionality shut down
-10060 Connection attempt timed out before the connection could be established
-10061 Connection attempt was forcefully rejected
-10091 Network subsystem is not yet ready for communication
-10092 Windows Sockets DLL does not support the requested Winsock protocol version
-10093 Windows Sockets not initialized
-11001 Requested database information does not exist; as confirmed by an authoritative host
-11002 Requested information was not found but the answer was not authoritative
-11003 Non-recoverable error occurred
-11004 Name supplied was valid but no information of the requested type is in the database
-15000 They need to be issued a new USB HASP key


The following items are not error codes returned by any of the external commands. These are response codes which the SMTP protocol has defined to communicate various states during client-server communication. Developers may find this list useful if they are writing their own mail communication procedures using low-level TCP commands.

211 System status, or system help reply
214 Help message [Information on how to use the receiver or the meaning of a particular non-standard command; this reply is useful only to the human user]
220 Service ready
221 Service closing transmission channel
250 Requested mail action okay, completed
251 User not local; will forward to
354 Start mail input; end with .
421 Service not available, closing transmission channel [This may be a reply to any command if the service knows it must shut down]
450 Requested mail action not taken: mailbox unavailable [e.g., mailbox busy]
451 Requested action aborted: local error in processing
452 Requested action not taken: insufficient system storage
500 Syntax error, command unrecognized [This may include errors such as command line too long]
501 Syntax error in parameters or arguments
502 Command not implemented
503 Bad sequence of commands
504 Command parameter not implemented
550 Requested action not taken: mailbox unavailable [e.g., mailbox not found, no access]
551 User not local; please try
552 Requested mail action aborted: exceeded storage allocation
553 Requested action not taken: mailbox name not allowed [e.g., mailbox syntax incorrect]
554 Transaction failed

FTP RFC Values

The following items are not error codes returned by any of the external commands. These are response codes which the FTP protocol has defined to communicate various states during client-server communication. Developers may find this list useful when writing their own file transfer procedures using low-level TCP commands.

110 Restart marker reply. In this case, the text is exact and not left to the particular implementation; it must read:
MARK yyyy = mmmm Where yyyy is User-process data stream marker, and mmmm server's equivalent marker (note the spaces between markers and "=").
120 Service ready in nnn minutes.
125 Data connection already open; transfer starting.
150 File status okay; about to open data connection.
200 Command okay.
202 Command not implemented, superfluous at this site.
211 System status, or system help reply.
212 Directory status.
213 File status.
214 Help message on how to use the server or the meaning of a particular non-standard command. This reply is useful only to the human user.
215 NAME system type. Where NAME is an official system name from the list in the Assigned Numbers document.
220 Service ready for new user.
221 Service closing control connection. Logged out if appropriate.
225 Data connection open; no transfer in progress.
226 Closing data connection. Requested file action successful (e.g., file transfer or file abort).
227 Entering Passive Mode (h1,h2,h3,h4,p1,p2).
230 User logged in, proceed.
250 Requested file action okay, completed.
257 "PATHNAME" created.
331 User name okay, need password.
332 Need account for login.
350 Requested file action pending further information.
421 Service not available, closing control connection. This may be a reply to any command if the service knows it must shut down.
425 Can't open data connection.
426 Connection closed; transfer aborted.
450 Requested file action not taken. File unavailable (file busy).
451 Requested action aborted: local error in processing.
452 Requested action not taken. Insufficient storage space in system.
500 Syntax error, command unrecognized. This may include errors such as command line too long.
501 Syntax error in parameters or arguments.
502 Command not implemented.
503 Bad sequence of commands.
504 Command not implemented for that parameter.
530 Not logged in.
532 Need account for storing files.
550 Requested action not taken. File unavailable (e.g., file not found, no access).
551 Requested action aborted: page type unknown.
552 Requested file action aborted. Exceeded storage allocation (for current directory or dataset).
553 Requested action not taken. File name not allowed.