SUMMARY
This article contains a list of possible error codes that may be returned by the Microsoft mail clients listed at the beginning of this article. The following list of error codes may be returned when a failure occurs sending and receiving mail.

The list contains the following fields:

? Error Code
? Error Type
? Description

Code:
General Errors
--------------

 * * * *ERROR CODE * ERROR TYPE * * * * * * * * * * DESCRIPTION
 * * * *---------- * ------------------------ * * * ---------------------------------
 * * * *0x800CCC00 * LOAD_SICILY_FAILED * * * * * * Authentication did not load.
 * * * *0x800CCC01 * INVALID_CERT_CN * * * * * * * *Invalid certificate content.
 * * * *0x800CCC02 * INVALID_CERT_DATE * * * * * * *Invalid certificate date.
 * * * *0x800CCC03 * ALREADY_CONNECTED * * * * * * *User already connected.
 * * * *0x800CCC04 * CONN
 * * * *0x800CCC05 * NOT_CONNECTED * * * * * * * * *Not connected to server.
 * * * *0x800CCC06 * CONN_SEND
 * * * *0x800CCC07 * WOULD_BLOCK
 * * * *0x800CCC08 * INVALID_STATE
 * * * *0x800CCC09 * CONN_RECV
 * * * *0x800CCC0A * INCOMPLETE * * * * * * * * * * Message download incomplete.
 * * * *0x800CCC0B * BUSY * * * * * * * * * * * * * Server or maildrop is busy.
 * * * *0x800CCC0C * NOT_INIT
 * * * *0x800CCC0D * CANT_FIND_HOST * * * * * * * * Cannot locate server.
 * * * *0x800CCC0E * FAILED_TO_CONNECT * * * * * * *Cannot connect to server.
 * * * *0x800CCC0F * CONNECTION_DROPPED * * * * * * Connection closed.
 * * * *0x800CCC10 * INVALID_ADDRESS * * * * * * * *Address not known on server.
 * * * *0x800CCC11 * INVALID_ADDRESS_LIST * * * * * Mailing list not known on server.
 * * * *0x800CCC12 * SOCKET_READ_ERROR * * * * * * *Unable to send WINSOCK request.
 * * * *0x800CCC13 * SOCKET_WRITE_ERROR * * * * * * Unable to read Winsock reply.
 * * * *0x800CCC14 * SOCKET_INIT_ERROR * * * * * * *Unable to initialize Winsock.
 * * * *0x800CCC15 * SOCKET_CONNECT_ERROR * * * * * Unable to open Windows Socket.
 * * * *0x800CCC16 * INVALID_ACCOUNT * * * * * * * *User account not recognized.
 * * * *0x800CCC17 * USER_CANCEL * * * * * * * * * *User canceled operation.
 * * * *0x800CCC18 * SICILY_LOGON_FAILED * * * * * *Logon attempt failed.
 * * * *0x800CCC19 * TIMEOUT
 * * * *0x800CCC1A * SECURE_CONNECT_FAILED * * * * *Unable to connect using Secure
 * * * * * * * * * * * * * * * * * * * * * * * * * *Sockets Layer (SSL).

WINSOCK Errors
--------------

 * * * *ERROR CODE * ERROR TYPE * * * * * * * * * * DESCRIPTION
 * * * *---------- * ------------------------ * * * ------------------------------------
 * * * *0x800CCC40 * WINSOCK_WSASYSNOTREADY * * * * Network subsystem is unusable.
 * * * *0x800CCC41 * WINSOCK_WSAVERNOTSUPPORTED * * Windows Sockets cannot support this
 * * * * * * * * * * * * * * * * * * * * * * * * * *application.
 * * * *0x800CCC42 * WINSOCK_WSAEPROCLIM
 * * * *0x800CCC43 * WINSOCK_WSAEFAULT * * * * * * *Bad address.
 * * * *0x800CCC44 * WINSOCK_FAILED_WSASTARTUP * * *Unable to load Windows Sockets.
 * * * *0x800CCC45 * WINSOCK_WSAEINPROGRESS * * * * Operation now in progress. This error
 * * * * * * * * * * * * * * * * * * * * * * * * * *appears if a Windows Sockets API is
 * * * * * * * * * * * * * * * * * * * * * * * * * *called while a blocking function is in
 * * * * * * * * * * * * * * * * * * * * * * * * * *progress.

Simple Mail Transport Protocol (SMTP) Errors
--------------------------------------------

 * * * *ERROR CODE * ERROR TYPE * * * * * * * * * * DESCRIPTION
 * * * *---------- * ------------------------ * * * ---------------------------------
 * * * *0x800CCC60 * SMTP_RESPONSE_ERROR * * * * * *Invalid response.
 * * * *0x800CCC61 * SMTP_UNKNOWN_RESPONSE_CODE * * Unknown error code.
 * * * *0x800CCC62 * SMTP_500_SYNTAX_ERROR * * * * *Syntax error returned.
 * * * *0x800CCC63 * SMTP_501_PARAM_SYNTAX * * * * *Parameter syntax incorrect.
 * * * *0x800CCC64 * SMTP_502_COMMAND_NOTIMPL * * * Command not implemented.
 * * * *0x800CCC65 * SMTP_503_COMMAND_SEQ * * * * * Improper command sequence.
 * * * *0x800CCC66 * SMTP_504_COMMAND_PARAM_NOTIMPL Command not implemented.
 * * * *0x800CCC67 * SMTP_421_NOT_AVAILABLE * * * * Command not available.
 * * * *0x800CCC68 * SMTP_450_MAILBOX_BUSY * * * * *Mailbox is locked and busy.
 * * * *0x800CCC69 * SMTP_550_MAILBOX_NOT_FOUND * * Mailbox not found.
 * * * *0x800CCC6A * SMTP_451_ERROR_PROCESSING * * *Error processing request.
 * * * *0x800CCC6B * SMTP_551_USER_NOT_LOCAL * * * *User mailbox is known, but mailbox
 * * * * * * * * * * * * * * * * * * * * * * * * * *not on this server.
 * * * *0x800CCC6C * SMTP_452_NO_SYSTEM_STORAGE * * No space to store messages.
 * * * *0x800CCC6D * SMTP_552_STORAGE_OVERFLOW * * *Storage limit exceeded.
 * * * *0x800CCC6E * SMTP_553_MAILBOX_NAME_SYNTAX * Invalid mailbox name syntax.
 * * * *0x800CCC6F * SMTP_554_TRANSACT_FAILED * * * Transaction failed.
 * * * *0x800CCC78 * SMTP_REJECTED_SENDER * * * * * Unknown sender. This is caused by
 * * * * * * * * * * * * * * * * * * * * * * * * * *having the incorrect e-mail address
 * * * * * * * * * * * * * * * * * * * * * * * * * *in the Reply-To field.
 * * * *0x800CCC79 * SMTP_REJECTED_RECIPIENTS * * * Server rejected recipients.
 * * * *0x800CCC7A * SMTP_NO_SENDER * * * * * * * * No sender address specified.
 * * * *0x800CCC7B * SMTP_NO_RECIPIENTS * * * * * * No recipients specified.

Post Office Protocol version 3 (POP3) Errors
--------------------------------------------

 * * * *ERROR CODE * ERROR TYPE * * * * * * * * * * DESCRIPTION
 * * * *---------- * ------------------------ * * * ------------------------------------
 * * * *0x800420CB * POP3_NO_STORE * * * * * * * * *Mail cannot be stored on server.
 * * * *0x800CCC90 * POP3_RESPONSE_ERROR * * * * * *Client response invalid.
 * * * *0x800CCC91 * POP3_INVALID_USER_NAME * * * * Invalid user name or user not found.
 * * * *0x800CCC92 * POP3_INVALID_PASSWORD * * * * *Password not valid for account.
 * * * *0x800CCC93 * POP3_PARSE_FAILURE * * * * * * Unable to interpret response.
 * * * *0x800CCC94 * POP3_NEED_STAT * * * * * * * * STAT Command required.
 * * * *0x800CCC95 * POP3_NO_MESSAGES * * * * * * * No messages on server.
 * * * *0x800CCC96 * POP3_NO_MARKED_MESSAGES * * * *No messages marked for retrieval.
 * * * *0x800CCC97 * POP3_POPID_OUT_OF_RANGE * * * *Message ID out of range.

HTTPMail Error
--------------

 * * * *ERROR CODE * ERROR TYPE * * * * * * * * * * DESCRIPTION
 * * * *---------- * ------------------------ * * * --------------------------------
 * * * *0x800CCC31 * * * * * * * * * * * * * * * * *Bad Request Configuration Bad or
 * * * * * * * * * * * * * * * * * * * * * * * * * *malformed request.

Network News Transport Protocol (NNTP) Errors
---------------------------------------------


 * * * *ERROR CODE * ERROR TYPE * * * * * * * * * * DESCRIPTION
 * * * *---------- * ------------------------ * * * --------------------------------
 * * * *0x800CCCA0 * NNTP_RESPONSE_ERROR * * * * * *News server response error.
 * * * *0x800CCCA1 * NNTP_NEWGROUPS_FAILED * * * * *Newsgroup access failed.
 * * * *0x800CCCA2 * NNTP_LIST_FAILED * * * * * * * LIST command to server failed.
 * * * *0x800CCCA3 * NNTP_LISTGROUP_FAILED * * * * *Unable to display list.
 * * * *0x800CCCA4 * NNTP_GROUP_FAILED * * * * * * *Unable to open group.
 * * * *0x800CCCA5 * NNTP_GROUP_NOTFOUND * * * * * *Group not on server.
 * * * *0x800CCCA6 * NNTP_ARTICLE_FAILED * * * * * *Message not on server.
 * * * *0x800CCCA7 * NNTP_HEAD_FAILED * * * * * * * Message header not found.
 * * * *0x800CCCA8 * NNTP_BODY_FAILED * * * * * * * Message body not found.
 * * * *0x800CCCA9 * NNTP_POST_FAILED * * * * * * * Unable to post to server.
 * * * *0x800CCCAA * NNTP_NEXT_FAILED * * * * * * * Unable to open next message.
 * * * *0x800CCCAB * NNTP_DATE_FAILED * * * * * * * Unable to display date.
 * * * *0x800CCCAC * NNTP_HEADERS_FAILED * * * * * *Unable to display headers.
 * * * *0x800CCCAD * NNTP_XHDR_FAILED * * * * * * * Unable to display MIME headers.
 * * * *0x800CCCAE * NNTP_INVALID_USERPASS * * * * *Invalid user or password.

Remote Access Service (RAS) Errors
----------------------------------

 * * * *ERROR CODE * ERROR TYPE * * * * * * * * * * DESCRIPTION
 * * * *---------- * ------------------------ * * * ------------------------------
 * * * *0x800CCCC2 * RAS_NOT_INSTALLED * * * * * * *RAS/DUN not installed.
 * * * *0x800CCCC3 * RAS_PROCS_NOT_FOUND * * * * * *RAS/DUN process not found.
 * * * *0x800CCCC4 * RAS_ERROR * * * * * * * * * * *RAS/DUN error returned.
 * * * *0x800CCCC5 * RAS_INVALID_CONNECTOID * * * * Connectoid damaged or missing.
 * * * *0x800CCCC6 * RAS_GET_DIAL_PARAMS * * * * * *Error getting dial settings.

Internet Message Access Protocol (IMAP) Errors
----------------------------------------------

 * * * *ERROR CODE * ERROR TYPE * * * * * * * * * * DESCRIPTION
 * * * *---------- * ------------------------ * * * -----------------------------
 * * * *0x800CCCD1 * IMAP_LOGINFAILURE * * * * * * *Login failed.
 * * * *0x800CCCD2 * IMAP_TAGGED_NO_RESPONSE * * * *Message tagged.
 * * * *0x800CCCD3 * IMAP_BAD_RESPONSE * * * * * * *Invalid response to request.
 * * * *0x800CCCD4 * IMAP_SVR_SYNTAXERR * * * * * * Syntax error.
 * * * *0x800CCCD5 * IMAP_NOTIMAPSERVER * * * * * * Not an IMAP server.
 * * * *0x800CCCD6 * IMAP_BUFFER_OVERFLOW * * * * * Buffer limit exceeded.
 * * * *0x800CCCD7 * IMAP_RECVR_ERROR * * * * * * * Recovery error.
 * * * *0x800CCCD8 * IMAP_INCOMPLETE_LINE * * * * * Incomplete data.
 * * * *0x800CCCD9 * IMAP_CONNECTION_REFUSED * * * *Connection not allowed.
 * * * *0x800CCCDA * IMAP_UNRECOGNIZED_RESP * * * * Unknown response.
 * * * *0x800CCCDB * IMAP_CHANGEDUID * * * * * * * *User ID has changed.
 * * * *0x800CCCDC * IMAP_UIDORDER * * * * * * * * *User ID command failed.
 * * * *0x800CCCDD * IMAP_UNSOLICITED_BYE * * * * * Unexpected disconnect.
 * * * *0x800CCCDE * IMAP_IMPROPER_SVRSTATE * * * * Invalid server state.
 * * * *0x800CCCDF * IMAP_AUTH_NOT_POSSIBLE * * * * Unable to authorize client.
 * * * *0x800CCCE0 * IMAP_OUT_OF_AUTH_METHODS * * * No more authorization types.
Note Any of the General, POP3, SMTP, IMAP, NNTP , or HTTPMail error messages may appear for the specific reason noted, or may appear as a result of no server response.

REFERENCES
For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

195458 OLEXP: Unable to send or receive messages in Outlook Express
181429 OLEXP: AOL news and e-mail servers are not compatible with Outlook Express
302339 OLEXP: Error message: the connection to the server has failed...Error 0x800CCC0E
254926 OLEXP: You cannot send a message with graphic attachments
236032 OLEXP: Outlook Express and Outlook repeatedly prompt you for your password
298589 OLEXP: You are repeatedly prompted for credentials when you log on to your mail server

APPLIES TO
? Microsoft Outlook Express 6.0
? Microsoft Outlook Express 6.0
? Microsoft Outlook Express 6.0
? Microsoft Outlook Express 6.0
? Microsoft Outlook Express 6.0
? Microsoft Outlook Express 6.0