# Error code reference

<table><thead><tr><th>Category</th><th width="98.199951171875" align="right">Code</th><th width="246.2220458984375">Error code</th><th>Description</th></tr></thead><tbody><tr><td>ACCESS / AUTHENTICATION</td><td align="right">0001</td><td>ACCESS_DENIED</td><td>Access denied: the user is not permitted to perform the requested action on the remote resource.</td></tr><tr><td>ACCESS / AUTHENTICATION</td><td align="right">0002</td><td>AUTHENTICATION_FAILED</td><td>Authentication failed: invalid credentials or login rejected by the server.</td></tr><tr><td>ACCESS / AUTHENTICATION</td><td align="right">0003</td><td>AUTH_REQUIREMENT_NOT_MET</td><td>Authentication requirement not met: the server requires an additional account or authentication condition that was not satisfied.</td></tr><tr><td>ACCESS / AUTHENTICATION</td><td align="right">0004</td><td>SECURE_SESSION_REQUIRED</td><td>Secure session required: the server refuses a plain-text connection or a mandatory security policy is not met.</td></tr><tr><td>ACCESS / AUTHENTICATION</td><td align="right">0005</td><td>SSL_CONTEXT_INIT_FAILED</td><td>SSL/TLS context initialisation failed: the requested algorithm is not available or the security provider is not configured correctly.</td></tr><tr><td>ACCESS / AUTHENTICATION</td><td align="right">0006</td><td>SSL_HANDSHAKE_FAILED</td><td>SSL/TLS handshake failed: the secure channel could not be established. Check certificate validity, protocol version, and cipher-suite compatibility.</td></tr><tr><td>ACCESS / AUTHENTICATION</td><td align="right">0007</td><td>SSH_HOST_KEY_UNVERIFIABLE</td><td>SSH host key not verifiable: the server's host key is missing from the known-hosts store or its fingerprint does not match the stored value.</td></tr><tr><td>CONNECTION</td><td align="right">0100</td><td>REMOTE_SERVICE_UNAVAILABLE</td><td>Remote service unavailable: the server is not accepting connections or has closed the current session.</td></tr><tr><td>CONNECTION</td><td align="right">0101</td><td>CONNECTION_FAILED</td><td>Connection failed: a network or socket error occurred before the server could respond.</td></tr><tr><td>CONNECTION</td><td align="right">0102</td><td>CONNECTION_TIMEOUT</td><td>Connection timeout: the connection attempt exceeded the allowed time limit before the server responded.</td></tr><tr><td>CONNECTION</td><td align="right">0103</td><td>TRANSFER_CHANNEL_UNAVAILABLE</td><td>Transfer channel unavailable: the data channel could not be opened for the requested transfer.</td></tr><tr><td>CONNECTION</td><td align="right">0104</td><td>TRANSFER_INTERRUPTED</td><td>Transfer interrupted: the file transfer was aborted before completion.</td></tr><tr><td>DESTINATION / STORAGE</td><td align="right">0200</td><td>DESTINATION_NOT_FOUND</td><td>Destination not found: the specified remote destination path does not exist.</td></tr><tr><td>DESTINATION / STORAGE</td><td align="right">0201</td><td>SOURCE_NOT_FOUND</td><td>Source not found: the local file selected for transfer does not exist.</td></tr><tr><td>DESTINATION / STORAGE</td><td align="right">0202</td><td>REMOTE_RESOURCE_BUSY</td><td>Remote resource busy: the remote resource is temporarily unavailable or locked. The operation may succeed if retried later.</td></tr><tr><td>DESTINATION / STORAGE</td><td align="right">0203</td><td>REMOTE_STORAGE_FULL</td><td>Remote storage full: the server has insufficient space to store the file.</td></tr><tr><td>DESTINATION / STORAGE</td><td align="right">0204</td><td>QUOTA_EXCEEDED</td><td>Quota exceeded: the storage quota limit has been reached on the remote server.</td></tr><tr><td>DESTINATION / STORAGE</td><td align="right">0205</td><td>INVALID_REMOTE_NAME</td><td>Invalid remote name: the remote file name or path was rejected by the server.</td></tr><tr><td>DESTINATION / STORAGE</td><td align="right">0206</td><td>FILE_ALREADY_EXISTS</td><td>File already exists: the target file already exists on the remote server and the configured overwrite policy blocks the transfer.</td></tr><tr><td>REQUEST / PROTOCOL</td><td align="right">0300</td><td>INVALID_REQUEST</td><td>Invalid request: the command or request sent to the server was malformed, contained invalid parameters, or was issued in an incorrect sequence.</td></tr><tr><td>REQUEST / PROTOCOL</td><td align="right">0301</td><td>UNSUPPORTED_OPERATION</td><td>Unsupported operation: the requested command, operation, or parameter is not supported by the remote server.</td></tr><tr><td>REQUEST / PROTOCOL</td><td align="right">0302</td><td>REMOTE_PROCESSING_ERROR</td><td>Remote processing error: the server encountered an internal failure while processing the request.</td></tr><tr><td>REQUEST / PROTOCOL</td><td align="right">0304</td><td>UNKNOWN_REMOTE_ERROR</td><td>Unknown remote error: the server returned an unrecognised error response that could not be mapped to a specific canonical error code.</td></tr><tr><td>CONFIGURATION / PARAMETERS</td><td align="right">5001</td><td>CONFIG_MISSING_HOST</td><td>Configuration error: required parameter 'host' is missing.</td></tr><tr><td>CONFIGURATION / PARAMETERS</td><td align="right">5002</td><td>CONFIG_MISSING_PORT</td><td>Configuration error: required parameter 'port' is missing.</td></tr><tr><td>CONFIGURATION / PARAMETERS</td><td align="right">5003</td><td>CONFIG_INVALID_PORT</td><td>Configuration error: invalid port number (must be between 1 and 65535).</td></tr><tr><td>CONFIGURATION / PARAMETERS</td><td align="right">5004</td><td>CONFIG_MISSING_CREDENTIALS</td><td>Configuration error: credentials are not configured (provide username/password, a private key, or a certificate).</td></tr><tr><td>CONFIGURATION / PARAMETERS</td><td align="right">5005</td><td>CONFIG_INVALID_URL</td><td>Configuration error: the URL is missing or malformed.</td></tr><tr><td>CONFIGURATION / PARAMETERS</td><td align="right">5006</td><td>CONFIG_UNSUPPORTED_PROTOCOL</td><td>Configuration error: the requested protocol is not supported.</td></tr><tr><td>CONFIGURATION / PARAMETERS</td><td align="right">5007</td><td>CONFIG_INVALID_PARAMETER</td><td>Configuration error: one or more configuration parameters are invalid.</td></tr><tr><td>CONFIGURATION / PARAMETERS</td><td align="right">5008</td><td>CONFIG_MISSING_LOCAL_PATH</td><td>Configuration error: the local file path is not specified.</td></tr><tr><td>CONFIGURATION / PARAMETERS</td><td align="right">5009</td><td>CONFIG_MISSING_REMOTE_PATH</td><td>Configuration error: the remote path is not specified.</td></tr><tr><td>INTERNAL / UNEXPECTED</td><td align="right">9001</td><td>INTERNAL_ERROR</td><td>Internal error: an unexpected error occurred and was not handled.</td></tr><tr><td>INTERNAL / UNEXPECTED</td><td align="right">9002</td><td>INTERNAL_IO_ERROR</td><td>Internal I/O error: a generic input/output failure occurred.</td></tr><tr><td>INTERNAL / UNEXPECTED</td><td align="right">9003</td><td>INTERNAL_ENCODING_ERROR</td><td>Internal encoding error: failed to encode or decode the message.</td></tr><tr><td>INTERNAL / UNEXPECTED</td><td align="right">9004</td><td>INTERNAL_TIMEOUT</td><td>Internal timeout: the operation exceeded its allowed time limit.</td></tr><tr><td>INTERNAL / UNEXPECTED</td><td align="right">9005</td><td>INTERNAL_UNSUPPORTED_OPERATION</td><td>Unsupported operation: the current protocol implementation does not support this operation.</td></tr></tbody></table>


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