The All-in-One WP Migration plugin communicates with your server and stores backups using the FTP extension. You may receive one of these errors if there is an error communicating with the server and the files stored in your account.

What can you do about it?

If the All-in-One WP Migration plugin cannot connect to your FTP storage, please sign out from your account and sign in again in the FTP Settings page of the plugin on your WordPress Console.
Ensure that there are no other applications using your server at the same time as the All-in-One WP Migration extension. If you have other 3rd party applications or other services that are connected, consider stopping or uninstalling them. If you share large numbers of documents with other people or the public, consider an alternative solution.

Please see more specific detail about each error code below:

Invalid Credentials
The All-in-One WP migration plugin cannot connect to your server. Please sign out from your account and sign in again in the FTP Settings of the plugin on your WordPress Console.

The user does not have sufficient permissions for a file
The All-in-One WP migration plugin cannot access a file or folder on your FTP. Please check that your account has permissions on the file or folder that you are trying to access with the plugin.
If this does not work, or if the file is on your server, please sign out from your account and sign in again in the FTP Settings page of the plugin on your WordPress Console.

Cannot be used within the domain
The All-in-One WP migration plugin cannot access your FTP server. If you are attempting to backup op or migrate your site whilst logged in on a corporate domain, please check that you are able to access your FTP server or contact the domain administrator.

File not found
The All-in-One WP migration plugin cannot access a file or folder on storage. Please check that the file exists and that you can access it through your FTP access.

Backend Error
An unexpected error occurred with your FTP storage while processing the request. Please try again. Please sign out from your account and sign in again in the FTP Settings page of the plugin on your WordPress Console.

Bad Request
The All-in-One WP migration plugin cannot connect to your FTP storage. Please sign out from your account and sign in again in the FTP Settings of the plugin on your WordPress Console.

User Rate Limit Exceeded
There have been too many API calls on your server account. Try again after stopping drive sync and any other applications that connect to your storage and waiting for 5 minutes

Rate Limit Exceeded
There have been too many API calls on your server account. Try again after stopping drive sync and any other applications that connect to your storage and waiting for 5 minutes.

Sharing Rate Limit Exceeded
You have exceeded the sharing rate limit on your account. This can be related to emails or documents that you are sharing publicly from your storage. Don’t send large volumes of emails when you are doing backups/migrations. Remove permissions on publicly available files in your FTP storage.

The user has not granted access to the file
The All-in-One WP migration plugin cannot access a file or folder on your server. Please check that your account has permissions on the file or folder that you are trying to access with the plugin. If this does not work, or if the file is stored on your FTP storage, please sign out from your account and sign in again in the FTP Settings page of the plugin on your WordPress Console.

Too Many Requests
There have been too many requests on your server account. This can be related to documents that you are sharing publicly from your FTP storage or other applications that are using your account.

Here is a complete list of HTTP error codes:

*press control F to search this page

Code: 400 ‘Bad Request’
Cannot process the request because it is malformed or incorrect.

Code: 401 ‘Unauthorized’
Required authentication information is either missing or not valid for the resource.

Code: 403 ‘Forbidden’
Access is denied to the requested resource. The user might not have enough permission.

Code: 404 ‘Not Found’
The requested resource doesn’t exist.

Code: 405 ‘Method Not Allowed’
The HTTP method in the request is not allowed on the resource.

Code: 406 ‘Not Acceptable’
This service doesn’t support the format requested in the Accept header. The requested resource is capable of generating only content not acceptable according to the Accept headers sent in the request.

Code: 407 ‘Proxy Authentication Required’
Proxy authentication required. The client must first authenticate themselves with the proxy.

Code: 408 ‘Request Timeout’
Request timed out. The server timed out waiting for the request. The client did not produce a request within the time that the server was prepared to wait. Repeat the request without modifications at any later time.

Code: 409 ‘Conflict’
The current state conflicts with what the request expects. The conflict could not allow the request to process.

Code: 410 ‘Gone’
The requested resource is no longer available at the server.

Code: 411 ‘Length Required’
The request requires a Content-Length based header.

Code: 412 ‘Precondition Failed’
The server does not meet one of the preconditions that the requester put on the request.

Code 413 ‘Request Entity Too Large’
The request size exceeds the maximum limit.

Code 414 ‘Request-URI Too Long’
Request-URI too long. The URI provided was too long for the server to process.

Code: 415 ‘Unsupported Media Type’
The service does not support the content type of the request format.

Code: 416 ‘Requested Range Not Satisfiable’
The specified byte range is invalid or unavailable.

Code: 417 ‘Expectation Failed’
Expectation failed. The server cannot meet the requirements of the Expect request-header field.

Code: 422 ‘Unprocessable Entity’
Cannot process the request because it is semantically incorrect.

Code: 429 ‘Too Many Requests’
Client application has been throttled and should not attempt to repeat the request until an amount of time has elapsed.

Code: 500 ‘Internal Server Error’
There was an interntal error while processing the request.

Code: 501 ‘Not Implemented’
The requested feature is not implemented.

Code: 502 ‘Bad Gateway’
Bad gateway. The server was acting as a gateway or a proxy and received an invalid response from the upstream server.

Code: 503 ‘Service Unavailable’
The service is temporarily unavailable. You may repeat the request after a delay. There may be a Retry-After header.

Code: 504 ‘504 Gateway Timeout’
The server was acting as a gateway or proxy and did not receive a timely response from the upstream server.

Code: 505 ‘HTTP Version Not Supported’
The server does not support the HTTP protocol version used in the request.

Here is a complete list of cURL error codes with their meaning:

*press control F to search this page

Code: 1 ‘CURLE_UNSUPPORTED_PROTOCOL’
The URL you passed to libcurl used a protocol that this libcurl does not support. The support might be a compile-time option that you didn’t use, it can be a misspelled protocol string or just a protocol libcurl has no code for.

Code: 2 ‘CURLE_FAILED_INIT’
Very early initialization code failed. This is likely to be an internal error or problem, or a resource problem where something fundamental couldn’t get done at init time.

Code: 3 ‘CURLE_URL_MALFORMAT’
The format of the URL was improper.

Code: 4 ‘CURLE_NOT_BUILT_IN’
A requested feature, protocol or option was not found built-in in this libcurl due to a build-time decision. This means that a feature or option was not enabled or explicitly disabled when libcurl was built and in order to get it to function, you have to get a rebuilt libcurl.

Code: 5 ‘CURLE_COULDNT_RESOLVE_PROXY’
Couldn’t resolve proxy. Could not resolve the given proxy host.

Code: 6 ‘CURLE_COULDNT_RESOLVE_HOST’
Couldn’t resolve host. Could not resolve the given remote host.

Code: 7 ‘CURLE_COULDNT_CONNECT’
Failed to connect() to host or proxy.

Code: 8 ‘CURLE_FTP_WEIRD_SERVER_REPLY’
The server sent data libcurl couldn’t parse. This error code is used for more than just FTP and is aliased as CURLE_WEIRD_SERVER_REPLY since 7.51.0.

Code: 9 ‘CURLE_REMOTE_ACCESS_DENIED’
We were denied access to the resource given in the URL. For FTP, this occurs while trying to change to the remote directory.

Code: 10 ‘CURLE_FTP_ACCEPT_FAILED’
When an active FTP session is used, an error code was sent over the control connection or something similar while waiting for the server to reconnect.

Code: 11 ‘CURLE_FTP_WEIRD_PASS_REPLY’
After having sent the FTP password to the server, libcurl expects a proper reply. This error code indicates that an unexpected code was returned.

Code: 12 ‘CURLE_FTP_ACCEPT_TIMEOUT’
During an active FTP session while waiting for the server to connect, the CURLOPT_ACCEPTTIMEOUT_MS (or the internal default) timeout expired.

Code: 13 ‘CURLE_FTP_WEIRD_PASV_REPLY’
libcurl failed to get a sensible result back from the server as a response to either a PASV or a EPSV command. The server is flawed.

Code: 14 ‘CURLE_FTP_WEIRD_227_FORMAT’
FTP servers return a 227-line as a response to a PASV command. If libcurl fails to parse that line, this return code passes back.

Code: 15 ‘CURLE_FTP_CANT_GET_HOST’
An internal failure to lookup the host used for the new connection.

Code: 16 ‘CURLE_HTTP2’
A problem was detected in the HTTP2 framing layer. This is somewhat generic and can be one out of several problems, see the error buffer for details.

Code: 17 ‘CURLE_FTP_COULDNT_SET_TYPE’
Received an error when trying to set the transfer mode to binary or ASCII.

Code: 18 ‘CURLE_PARTIAL_FILE’
A file transfer was shorter or larger than expected. This happens when the server first reports an expected transfer size and then delivers data that doesn’t match the previously given size.

Code: 19 ‘CURLE_FTP_COULDNT_RETR_FILE’
This was either a weird reply to a ‘RETR’ command or a zero byte transfer complete.

Code: 21 ‘CURLE_QUOTE_ERROR’
When sending custom “QUOTE” commands to the remote server, one of the commands returned an error code that was 400 or higher (for FTP) or otherwise indicated unsuccessful completion of the command.

Code: 22 ‘CURLE_HTTP_RETURNED_ERROR’
This is returned if CURLOPT_FAILONERROR is set TRUE and the HTTP server returns an error code that is >= 400.

Code: 23 ‘CURLE_WRITE_ERROR’
An error occurred when writing received data to a local file, or an error was returned to libcurl from a write callback.

Code: 25 ‘CURLE_UPLOAD_FAILED’
Failed to start the upload. For FTP, the server typically denied the STOR command. The error buffer usually contains the server’s explanation for this.

Code: 26 ‘CURLE_READ_ERROR’
There was a problem reading a local file or an error returned by the read callback.

Code: 27 ‘CURLE_OUT_OF_MEMORY’
A memory allocation request failed. This is serious badness and things are severely screwed up if this ever occurs.

Code: 28 ‘CURLE_OPERATION_TIMEDOUT’
Operation timeout. The specified time-out period was reached according to the conditions.

Code: 30 ‘CURLE_FTP_PORT_FAILED’
The FTP PORT command returned error. This mostly happens when you haven’t specified a good enough address for libcurl to use. See CURLOPT_FTPPORT.

Code: 31 ‘CURLE_FTP_COULDNT_USE_REST’
The FTP REST command returned error. This should never happen if the server is sane.

Code: 33 ‘CURLE_RANGE_ERROR’
The server does not support or accept range requests.

Code: 34 ‘CURLE_HTTP_POST_ERROR’
This is an odd error that mainly occurs due to internal confusion.

Code: 35 ‘CURLE_SSL_CONNECT_ERROR’
A problem occurred somewhere in the SSL/TLS handshake. You really want the error buffer and read the message there as it pinpoints the problem slightly more. Could be certificates (file formats, paths, permissions), passwords, and others.

Code: 36 ‘CURLE_BAD_DOWNLOAD_RESUME’
The download could not resume because the specified offset was out of the file boundary.

Code: 37 ‘CURLE_FILE_COULDNT_READ_FILE’
A file is given with FILE:// couldn’t be opened. Most likely because the file path doesn’t identify an existing file. Did you check file permissions?

Code: 38 ‘CURLE_LDAP_CANNOT_BIND’
LDAP cannot bind. LDAP bind operation failed.

Code: 39 ‘CURLE_LDAP_SEARCH_FAILED’
LDAP search failed.

Code: 41 ‘CURLE_FUNCTION_NOT_FOUND’
Function not found. Could not find a required zlib function.

Code: 42 ‘CURLE_ABORTED_BY_CALLBACK’
Aborted by callback. A callback returned “abort” to libcurl.

Code: 43 ‘CURLE_BAD_FUNCTION_ARGUMENT’
Internal error. A function was called with a bad parameter.

Code: 45 ‘CURLE_INTERFACE_FAILED’
Interface error. A specified outgoing interface could not be used. Set which interface to use for outgoing connections’ source IP address with CURLOPT_INTERFACE.

Code: 47 ‘CURLE_TOO_MANY_REDIRECTS’
Too many redirects. When following redirects, libcurl hit the maximum amount. Set your limit with CURLOPT_MAXREDIRS.

Code: 48 ‘CURLE_UNKNOWN_OPTION’
An option passed to libcurl is not recognized/known. Refer to the appropriate documentation. This is most likely a problem in the program that uses libcurl. The error buffer might contain more specific information about which exact option it concerns.

Code: 49 ‘CURLE_TELNET_OPTION_SYNTAX’
A telnet option string was Illegally formatted.

Code: 51 ‘CURLE_PEER_FAILED_VERIFICATION’
The remote server’s SSL certificate or SSH md5 fingerprint was deemed not OK.

Code: 52 ‘CURLE_GOT_NOTHING’
Nothing was returned from the server, and under the circumstances, getting nothing is considered an error.

Code: 53 ‘CURLE_SSL_ENGINE_NOTFOUND’
The specified crypto engine wasn’t found.

Code: 54 ‘CURLE_SSL_ENGINE_SETFAILED’
Failed for setting the selected SSL crypto engine as default!

Code: 55 ‘CURLE_SEND_ERROR’
Failed sending network data.

Code: 56 ‘CURLE_RECV_ERROR’
Failure with receiving network data.

Code: 58 ‘CURLE_SSL_CERTPROBLEM’
problem with the local client certificate.

Code: 59 ‘CURLE_SSL_CIPHER’
Couldn’t use the specified cipher.

Code: 60 ‘CURLE_SSL_CACERT’
Cannot authenticate peer certificate with known CA certificates.

Code: 61 ‘CURLE_BAD_CONTENT_ENCODING’
Unrecognized transfer encoding.

Code: 62 ‘CURLE_LDAP_INVALID_URL’
Invalid LDAP URL.

Code: 63 ‘CURLE_FILESIZE_EXCEEDED’
Maximum file size exceeded.

Code: 64 ‘CURLE_USE_SSL_FAILED’
Requested FTP SSL level failed.

Code: 65 ‘CURLE_SEND_FAIL_REWIND’
When doing a send operation curl had to rewind the data to retransmit, but the rewinding operation failed.

Code: 66 ‘CURLE_SSL_ENGINE_INITFAILED’
Initiating the SSL Engine failed.

Code: 67 ‘CURLE_LOGIN_DENIED’
The remote server denied curl to login (Added in 7.13.1)

Code: 68 ‘CURLE_TFTP_NOTFOUND’
File not found on TFTP server.

Code: 69 ‘CURLE_TFTP_PERM’
Permission problem on TFTP server.

Code: 70 ‘CURLE_REMOTE_DISK_FULL’
Out of disk space on the server.

Code: 71 ‘CURLE_TFTP_ILLEGAL’
Illegal TFTP operation.

Code: 72 ‘CURLE_TFTP_UNKNOWNID’
Unknown TFTP transfer ID.

Code: 73 ‘CURLE_REMOTE_FILE_EXISTS’
File already exists and will not be overwritten.

Code: 74 ‘CURLE_TFTP_NOSUCHUSER’
This error should never be returned by a properly functioning TFTP server.

Code: 75 ‘CURLE_CONV_FAILED’
Character conversion failed.

Code: 76 ‘CURLE_CONV_REQD’
Caller must register conversion callbacks.

Code: 77 ‘CURLE_SSL_CACERT_BADFILE’
Problem with reading the SSL CA cert (path? access rights?)

Code: 78 ‘CURLE_REMOTE_FILE_NOT_FOUND’
The resource referenced in the URL does not exist.

Code: 79 ‘CURLE_SSH’
An unspecified error occurred during the SSH session.

Code: 80 ‘CURLE_SSL_SHUTDOWN_FAILED’
Failed to shut down the SSL connection.

Code: 81 ‘CURLE_AGAIN’
Socket is not ready for send/recv wait till it’s ready and try again. This return code only returns from curl_easy_recv and curl_easy_send (Added in 7.18.2)

Code: 82 ‘CURLE_SSL_CRL_BADFILE’
Failed to load CRL file (Added in 7.19.0)

Code: 83 ‘CURLE_SSL_ISSUER_ERROR’
Issuer check failed (Added in 7.19.0)

Code: 84 ‘CURLE_FTP_PRET_FAILED’
The FTP server does not understand the PRET command at all or does not support the given argument. Be careful when using CURLOPT_CUSTOMREQUEST, a custom LIST command will be sent with PRET CMD before PASV as well. (Added in 7.20.0)

Code: 85 ‘CURLE_RTSP_CSEQ_ERROR’
Mismatch of RTSP CSeq numbers.

Code: 86 ‘CURLE_RTSP_SESSION_ERROR’
Mismatch of RTSP Session Identifiers.

Code: 87 ‘CURLE_FTP_BAD_FILE_LIST’
Unable to parse FTP file list (during FTP wildcard downloading).

Code: 88 ‘CURLE_CHUNK_FAILED’
Chunk callback reported error.

Code: 89 ‘CURLE_NO_CONNECTION_AVAILABLE’
(For internal use only, will never be returned by libcurl) No connection available, the session will be queued. (added in 7.30.0)

Code: 90 ‘CURLE_SSL_PINNEDPUBKEYNOTMATCH’
Failed to match the pinned key specified with CURLOPT_PINNEDPUBLICKEY.

Code: 91 ‘CURLE_SSL_INVALIDCERTSTATUS’
The status returned failure when asked with CURLOPT_SSL_VERIFYSTATUS.

Code: 92 ‘CURLE_HTTP2_STREAM’
Stream error in the HTTP/2 framing layer.

Code: 93 ‘CURLE_RECURSIVE_API_CALL’
An API function was called from inside a callback.