The FTP Connector transfers files to and from a remote FTP server.
Each FTP Connector connects uploads to a specified folder and downloads from a set of folders on the remote FTP server.
Files that reach the FTP Connector in the ArcESB flow are uploaded to the upload target folder, and files found in the download target folder(s) are downloaded and entered into the ArcESB flow. The connector supports upload and download filters to only send and receive specified file names and/or file extensions.
This section contains all of the configurable connector properties.
Settings related to establishing the connection to the remote FTP host.
- Connector Id The static name of the connector. All connector-specific files are held in a folder by the same name within the Data Directory.
- Connector Description An optional field to provide free-form description of the connector and its role in the flow.
- Remote Host The hostname or IP address of the FTP server.
- SSL Type How to negotiate SSL/TLS when connecting to the server. When set to ‘Explicit’, a plaintext connection will be established and then SSL/TLS will be started with an explicit command. When set to ‘Implicit’, SSL/TLS will immediately be negotiated without first establishing a plaintext connection.
- Remote Port The port on which to connect to the FTP server.
Settings related to authenticating to the FTP server.
- User Name The username credential for logging in to the FTP server.
- Password The password credential for logging in to the FTP server.
Settings related to verifying the FTP server’s identity.
- Server Public Certificate If the FTP server is an SSL server (FTPS), this field should be set to the SSL Certificate that identifies the server. If the server’s certificate is not available, this field can be set to ‘Any Certificate’ to implicitly trust the server’s identity.
Settings related to uploading files to the FTP server.
- Remote Path Files processed by the connector will be uploaded to this specified remote folder.
Settings related to downloading from the FTP server.
- Remote Path The remote folder from which files will be downloaded. Multiple paths can be specified in a comma-delimited list.
- File Mask A glob pattern that determines which files within the Remote Path should be downloaded (e.g. *.txt).
- Overwrite local files Whether files that already exist on the local file system should be downloaded (overwritten) or skipped.
- Delete files (after received) Whether files that are successfully downloaded should be deleted from the FTP server afterwards.
Settings related to the automatic processing of files by the connector.
- Upload Whether files arriving at the connector will automatically be uploaded.
- Retry Interval The amount of time before a failed upload is retried.
- Retry Maximum Attempts The maximum number of times a failed upload will be retried.
- Download Whether the connector should automatically poll the remote download path(s) for files to download.
- Download Interval The interval between automatic download attempts.
- Minutes The number of minutes to wait before downloading. Only applicable when Download Interval is set to Minute.
- Minutes Past the Hour The minutes offset for an hourly schedule. Only applicable when Download Interval is set to Hourly. For example, if this value is set to 5, the automation service will download at 1:05, 2:05, 3:05, etc.
- Time The time within a given day that the download should occur. Only applicable when Download Interval is set to Daily, or Weekly, or Monthly.
- Day The day on which the download should occur. Only applicable when Download Interval is set to Weekly or Monthly.
- Cron Expression An arbitrary string representing a cron expression that determines when the download should occur. Only applicable when Download Interval is set to Advanced.
SSL Client Authentication
Settings related to client authentication when two-way SSL authentication is required.
- Private Certificate The private certificate presented during SSL client authentication.
- Certificate Password The password required to access the SSL client certificate.
Settings that determine the folder on disk that files will be sent/uploaded from, and the folder that they will be received/downloaded to.
- Input Folder (Send) The connector can send/upload files placed in this folder. If Send Automation is enabled, the connector will automatically poll this location for files to process.
- Output Folder (Receive) The connector will place received/downloaded files in this folder. If the connector is connected to another connector in the flow, files will not remain here and will instead be passed along to the Input/Send folder for the connected connector.
- Processed Folder (Sent) After processing a file, the connector will place a copy of sent/uploaded files in this folder if Save to Sent Folder is enabled.
An set of arbitrary FTP commands to execute on the remote server at various times during connector execution: directly after connecting, after downloading each file, after uploading each file, before downloading each file, and before uploading each file.
Settings related to the allocation of resources to the connector.
- Max Workers The maximum number of worker threads that will be consumed from the threadpool to process files on this connector. If set, overrides the default setting from the Profile tab.
- Max Files The maximum number of files that will be processed by the connector each time worker threads are assigned to the connector. If set, overrides the default setting from the Profile tab.
Settings not included in the previous categories.
- Account The Windows user account whose credentials should be presented to the FTP server.
- Active Mode Whether to enable Active or Passive mode on the remote FTP server. Passive mode is less likely to result in firewall interference with the connection.
- Clear Command Channel Whether the channel over which FTP commands are sent should be cleartext or encrypted.
- Download Excluded Extensions A comma-delimited list of file extensions that will not be downloaded by the connector.
- Download Excluded Prefixes A comma-delimited list of prefixes that instructs the connector not to download filenames that begin with a specified prefix.
- Enable File Size Comparison Whether to cache downloaded file names and sizes; if True then files will only be downloaded if they have not been downloaded before or have changed in size.
- Enable Timestamp Comparison Whether to cache downloaded file names and last-modified timestamps; if True then files will only be downloaded if they have not been downloaded before or have been modified since they were downloaded.
- Receive Filter A glob pattern filter to determine which files should be downloaded from the remote storage (e.g. *.txt). Negative patterns may be used to indicate files that should not be downloaded (e.g. -*.tmp). This setting should be used when multiple File Mask patterns are desired. Multiple patterns may be separated by commas, with later filters taking priority except when an exact match is found.
- Send Filter A glob pattern filter to determine which files in the Send folder will be uploaded by the connector (e.g. *.txt). Negative patterns may be used to indicate files that should not be uploaded (e.g. -*.tmp). Multiple patterns may be separated by commas, with later filters taking priority except when an exact match is found.
- Local File Scheme A filemask for determining local file names as they are downloaded by the connector. The following macros may be used to reference contextual information:
%ConnectorId%, %Filename%, %FilenameNoExt%, %Ext%, %ShortDate%, %LongDate%, %RegexFilename:%, %DateFormat:%.
As an example: %FilenameNoExt%_%ShortDate%%Ext%
- Log Level The verbosity of logs generated by the connector. When requesting support, it is recommended to set this to Debug.
- Max Download Files The maximum number of files that will be downloaded from the FTP server in one polling interval. If set to -1, no limit is applied.
- Parent Connector The connector from which settings should be inherited, unless explicitly overwritten within the existing connector configuration. Must be set to a connector of the same type as the current connector.
- Recurse Subdirectories Whether to download files in subfolders of the target remote path.
- Resume Downloads If enabled, when an error occurs during a file download, the connector will store the portion of the file that was downloaded and attempt to download the remainder of the file on the next download attempt.
- Resume Uploads If enabled, when an error occurs during a file upload, the connector will note the number of bytes that were transferred and attempt to upload the remainder of the file on the next upload attempt.
- Temp Download Extension Temporary file extension to append to file downloads while the transfer is in progress.
- Temp Upload Extension Temporary file extension to append to file uploads while the transfer is in progress.
- Temp Upload Path Temporary path on the remote FTP server where files will be uploaded. The file will be moved into the permanent upload path after the transfer is complete.
- Temp Upload Prefix Temporary file prefix to prepend to file uploads while the transfer is in progress.
- Timeout The duration the connector will wait for a connection response before throwing a timeout error.
- Transfer Mode Whether files will be transferred as ASCII or binary. If set to Default, the server will choose the transfer mode.
- Log Messages Whether the log entry for a processed file will include a copy of the file itself.
- Save to Sent Folder Whether files processed by the connector should be copied to the Sent folder for the connector.
Establishing a Connection
Connecting to the remote FTP server requires the following settings:
- Remote Host
- SSL Type
- Remote Port
- User Name
FTP servers may additionally require Server Public Certificate and/or SSL Client Authentication under the Advanced tab.
The FTP Connector uploads files from the Input/Send Folder that match the Send Filter set in the Advanced tab. Files are automatically uploaded to the FTP server if Upload Automation is enabled in the connector.
Remote Path should be set to the folder on the remote FTP server where files should be uploaded. The application changes directories to the specified folder after logging in to the server. A temporary upload extension, prefix, or path can be set in the Advanced tab to ensure that files have been fully transferred before they end up in the Remote Path folder.
If any files could not be uploaded, the connector attempts to send them later after Retry Interval minutes have elapsed. This process continues until the Retry Maximum Attempts setting has been reached, after which the connector will raise an error and the file will no longer be sent automatically.
Downloaded files are displayed in the Output/Receive Folder of the connector, or passed along to the next connector in the flow. Files are automatically downloaded from the FTP server if Download Automation is enabled in the connector, and can be manually downloaded by clicking the Receive button in the Output tab.
Remote Path should be set to the folder on the remote FTP server from which files should be downloaded. The application changes directories to the specified folder after logging in to the server. The File Mask property filters files such that only filenames matching the glob pattern are downloaded from the server. A temporary download extension or prefix can be set in the Advanced tab to ensure that files have been fully transferred before they end up in the Output/Receive Folder.
The Overwrite Local Files setting governs whether files that already exist in the Output/Receive Folder should be overwritten or not. The Delete files (after download) setting can be used to delete the files on the remote server after successfully downloading them. Within the Output tab, click the Receive to test these settings and retrieve the matching files from the server.