Version 21.0.8126


ArcESB 2021 is the latest version of several earlier application releases, including the following:

  • ArcESB 2020
  • RSSBus Connect 2016, 2017, 2018, and 2019
  • AS2 Connector V2 (/n software)
  • AS2 Connector V3, FTP Connector V1, OFTP Connector V2, and SFTP Connector V1 (RSSBus)
  • IP*Works! EDI AS2 Connector V7 (/n software)

Upgrading From ArcESB 2020

ArcESB 2021 functions as a drop-in upgrade to ArcESB 2020; simply running the installer for ArcESB 2021 will upgrade all necessary application resources. ArcESB 2021 requires new product keys to license the application, and you can request new keys from our sales team at sales@cdata.com.

The installer for ArcESB 2021 will attempt to detect existing installations of ArcESB 2020 and preserve the connectors, flows, and settings from the existing installation. If ArcESB 2020 was not installed in the default location, it may be necessary to point the ArcESB 2021 installer to the folder on disk where ArcESB 2020 was installed.

ArcESB 2021 can be installed separately from ArcESB 2020 by directing the ArcESB 2021 installer to a different folder than the one in which ArcESB 2020 was installed. Installations will not interfere with each other as long as they are installed to different folders.

Note for Java users: No matter how you choose to deploy Arc, the files and folders within AppDirectory must be readable and writable by the user running the application. The service installer included with the Java Edition setup will use ‘arcesb’ as this user.

If the application was previously run as a different user and you wish to restore the necessary permissions for an ‘arcesb’ user to run the application, the command would be something like:

sudo chown -R arcesb:arcesb /opt/arcesb.

ArcESB 2021 includes several improvements that may cause the application to behave differently from an ArcESB 2020 installation:

  • ArcESB 2021 manages users within the application rather than through server configuration, so some user settings may not transfer.
  • ArcESB 2021 does not automatically preserve subfolder structures found on FTP and SFTP servers.
  • ArcESB 2021 does not require Windows administrator privileges to run by default, so some folder permissions may need to be updated.

User Management

Previous versions of ArcESB managed users via the server configuration XML files (e.g. Web.Config, server.xml). ArcESB 2021 brings user management within the application itself, introducing a Users tab in the Settings page.

Users configured in previous versions will not persist in the new installation of ArcESB 2021 and should be recreated as necessary within the Users tab. More information about user management can be found in the User Roles page.

Subfolders in File Based Connectors

Note: This section is only relevant for users with file-based connectors, including File, FTP, and SFTP, that preserve the folder structure from remote file systems.

Previous versions of ArcESB exhibited the following behavior:

These file-based connectors target a single folder on a remote server from which to upload or download files. When files should also be downloaded from subfolders within this target folder, this same subfolder structure was recreated locally in the connector’s Output directory. Likewise for uploads, these connectors treated a file being in a subfolder of the Input directory as an indication of the subfolder the file should be placed in on the remote file system. This recreation of subfolder structure is what is meant by “preserving subfolder structures”.

ArcESB 2021 requires the use of the File Connector to mirror folder structures on remote systems. These file based connectors add a subfolder header to downloaded files if the file was stored in a subfolder of the target folder on the server. This subfolder header is used to automatically reproduce the subfolder structure when files are uploaded to remote file systems.

Windows Application Directory

The Windows edition of ArcESB 2021 stores the Application Directory (which holds the data for flows, connectors, profile settings, etc) in the C:\ProgramData folder by default. Previous versions of ArcESB used the C:\Program Files folder to house the Application Directory. This change helps ensure that ArcESB 2021 can run without administrator privileges by default.

When upgrading from ArcESB 2020 to ArcESB 2021, the application will re-use the Application Directory from the previous (2020) installation, but still attempt to run without administrator privileges by default. As a result, it may be necessary to set the access permission rules on the Application Directory within C:\Program Files to allow ArcESB access with lower running permissions.

Upgrading From RSSBus Connect 2016, 2017, 2018, or 2019

This section describes the process of upgrading from an earlier release of ArcESB or RSSBus Connect.

For help upgrading from an earlier version than RSSBus Connect 2016, please see Upgrading from AS2 Connector.

Drop-In Upgrade

Upgrading to ArcESB 2021 from RSSBus Connect 2016, 2017, 2018, or 2019 can be a one-step in-place upgrade. Simply run the ArcESB installer to update application resources (.exe’s, .dll’s, .jar’s, .war’s) without disturbing configuration data.

If the ArcESB installer detects an RSSBus Connect installation, the installer uses this same installation path to store configuration data (profile, connectors/ports, certificates). Thus, the settings from older versions are automatically used by the new ArcESB installation.

Manually Transferring Configuration Data

If an in-place upgrade is not possible, configuration data can still easily be transferred from previous versions of ArcESB/RSSBus Connect.

The first transfer method is to export connector (port) settings from the older version and import these connectors (ports) in the new version. Connectors (ports) can be exported from the Ports tab by clicking the cogwheel and selecting ‘Export Port Settings’. In later versions of RSSBus Connect, connectors (ports) can be exported from the Flows tab by right clicking the connector (port) in the flow and selecting ‘Export Port Settings’. Connectors can be imported from the Flows tab of ArcESB by clicking the cogwheel in the top-right and selecting ‘Import Workspace’.

The second method transfers all configuration data at once by managing folders on disk. All configuration information is held in the ‘data’ folder of the installation directory. Copying over the ‘data’ folder from a previous version into the same folder in the latest version will effectively copy over the entire application configuration.

The default installation directory for ArcESB is:

Windows: C:\Program Files\ArcESB
Java: /opt/arcesb

The default installation directory for RSSBus Connect is:

Windows: C:\Program Files\RSSBus\RSSBus Connect
Java: ~/rssbus/connect

On a Unix system, ‘~’ resolves to the home directory of the user where the Java servlet is installed. On a Windows system, ‘~’ resolves to %ProgramData%.

Note: If you do not see the ArcESB installation directory, check for the RSSBus Connect default installation directory. The ArcESB installer will attempt to detect RSSBus Connect installations and use the pre-existing folder structure from RSSBus Connect.

Upgrading Application Data Source Connectors

ArcESB introduced a new approach to connecting to external data sources that are applications rather than traditional databases (e.g. SalesForce, NetSuite, QuickBooks, etc). In RSSBus Connect, each external data source application required a dedicated connector (port) to interface with the application. In ArcESB, a single connector called the CData Connector is used to connect to each application data source.

CData Drivers

The CData Connector uses CData drivers to connect to a specific data source. CData is our parent company, and they provide the ADO.NET and JDBC drivers that enable connectivity to hundreds of cloud and on-premise applications, databases, and more. These drivers were used under-the-hood in previous RSSBus Connect connectors (ports), so the interface and approach to accessing data in these application data sources has not changed.

In order to upgrade this set of connectors (ports) to ArcESB, the appropriate CData driver must be installed and configured in a CData Connector. Please see the CData Connector documentation for details on installing CData drivers. Once the CData driver is installed and selected within the CData Connector’s settings, the CData Connector can be configured with the same connection settings and credentials that were used in RSSBus Connect connectors (e.g. the SalesForce Connector, the HubSpot Connector, etc).

Upgrading External Connectors

A small number of connectors that were previously external have moved to embedded in ArcESB 2021:

  • SQL Server
  • Oracle
  • PDF

These connectors will be appropriately installed along with the rest of the application, and they no longer require additional downloads.

Upgrading from AS2 Connector

This section also applies to upgrading from FTP Connector, OFTP Connector, and SFTP Connector.

Installing ArcESB

Windows Users

The Windows installation of ArcESB will target a different installation path than earlier versions of the product and listen on a different port. This change ensures that both releases can be run side-by-side without conflicting with one another. Simply run setup.exe and follow the prompts to install the application on the machine.

Java Users

As with previous versions of the AS2 Connector (and other releases in the Connector family), the application is provided as a distributable arcesb.war file. If you distribute this WAR file to your Java server using the server’s built-in deployment wizard, this replaces your existing installation of the AS2 Connector in its entirety, including trading partner profiles.

If you want to perform an in-place upgrade of the AS2 Connector and still preserve your profile settings between installations, create a copy of your previous installation’s data folder prior to deploying the new package. This data folder is located in the /WEB-INF/data/ folder under the existing Web application folder. Once you have copied this folder into a new location, deploy ArcESB in place of the existing installation. When launching the application for the first time, the connectors (ports) are not configured. Click Import Profiles to specify the location where you copied your data folder to restore your profiles.

Alternatively, you can rename the arcesb.war provided with ArcESB to install this version of the application as a parallel application.

Importing Profile Information

If you are upgrading from an earlier version of the AS2 Connector, SFTP Connector, or other previous versions, there are several methods available to detect and import your existing partner profile configurations.

Import Automatically

If you are installing the Windows edition of ArcESB on a machine where a previous version of the application was installed, the installation program attempts to detect the installation of the previous version and can import the profile settings from it. If a partner profile is detected that is of the same name as one already configured in ArcESB, this process will create a duplicate entry with a number appended to the identifying field to ensure that it is unique. You can safely delete duplicate profiles after they are imported.

Import Using the Admin API

ArcESB’s Admin API includes an import action that can be used to import settings from previous versions. The import action requires three parameters:

  • Arcflow - The base64-encoded string containing the Flow data. This string can be generated by base64-encoding the entire file contents of a .arcflow file.
  • Overwrite - How ArcESB should respond if an imported profile/partner configuration causes a conflict with the current configuration. If True, the existing configurations will be overwritten. Otherwise, an error will be thrown.
  • WorkspaceId - The Workspace into which the Flow will be imported. If unspecified, the application will attempt to determine which Workspace to import into (based on Workspace values within the Flow being imported) and fall back to the default Workspace if necessary.

All requests to the import action must be sent as HTTP POST requests.

More information about the Admin API can be found in the Admin API section.

Configuring a Transparent Upgrade

After running the installer for ArcESB and importing partner profiles from a previous installation of the application into ArcESB, the new version has backwards compatibility for receiving URLs in the old version. However, there are two key differences:

  • ArcESB uses a different local port than the application server used to host the previous installation of the application. This avoids conflicts with the installation of a previous version of the AS2 Connector so that you can maintain both versions of the application and transfer partners to the new version at your own pace.

  • The Incoming, Outgoing, and Sent Folders from the previous installation of the AS2 Connector are not automatically imported into the profiles used in ArcESB. By default, the application uses its own local file resources so as not to interfere with the currently running instance of the application. This also ensures that, if automation is enabled in the previous profile, the application does not immediately begin sending files that are waiting to be sent in the older version of the AS2 Connector.

If you want to replace your instance of the AS2 Connector:

  1. Determine whether you want to use the old folder structure from the previous installation of the AS2 Connector or use ArcESB’s default folder structure.
  2. Determine whether you wish to use your existing receiving URL or a new one.

Keeping Your Previous Folders

ArcESB 2021 adds a new File connector that allows you to interact with external folders in the file system as a separate logical step in your message flow. The following image shows an example of a flow that uses File connectors in this way:

AS2 Flow with File Connectors

A File connector placed at the beginning of a flow can be used to monitor your old path and pick up files for processing. To pick up files from a previously configured folder, follow these steps:

  1. Create a File connector in front of your newly imported connector and set its Path property to the previous outgoing folder. In the image above, this is the ‘File_Pickup’ connector.
  2. In the Flow designer, create the connection between the File connector and the upgraded connector.
  3. Enable the Receive Automation for the File connector to schedule the automation for file pickup. Files picked up from receive automation will be moved into the Send folder of the new connector by the application engine.

A File connector placed at the end of a flow can be used to offload received files onto the file system for an external process. To drop off files to a previously configured folder, follow these steps:

  1. Create a File connector after your newly imported connector and set its Path property to the previous incoming folder. In the image above, this is the ‘File_Dropoff’ connector.
  2. In the Flow designer, create the connection between the File connector and the upgraded connector. Files that are received on the upgraded connector will be sent to the path in the File connector after they are received.

This process allows you integrate with the local file system using the same resources that you used previously. However, if you add additional connectors in the future, the application creates these in a different data folder by default.


The existing back-end business logic is preserved for configured trading partners.


Additional connectors use a different data folder by default.

Switching to Use the New Folders

If you plan to add more partners or configure additional connectors in ArcESB, it may be best to switch to the new folder structure that ArcESB uses by default. This structure is described below.

ArcESB uses an Application Directory that contains all connector and profile configuration data. Each configured connector in ArcESB has its own folder within the data folder (for the default workspace) or appropriate workspace folder within the workspaces folder. The connector-specific folder contains the following folders:

  • Logs - A folder where the connector will write connector-specific logs.
  • Pending - Connectors that wait for a partner response will store pending messages in this folder (only certain connector types require this).
  • Receive - Connectors that receive/download files from an external source will place those files here. Connectors that operate on local data (without sending or receiving from an external source) will place files here after they are processed.
  • Send - Files placed in this folder are slated to be processed/sent/uploaded by the connector.
  • Sent - The connector places a copy of processed/sent/uploaded files here.

For AS2 Connectors, place files that should be sent to external trading partners in the connector’s Send folder, and pick up files received from external trading partners in the connector’s Receive folder.


A consistent folder structure will be maintained if additional trading partners are configured.


Business logic may need to be reconfigured to use the new folder structure.

Using a New URL

The server provided with ArcESB listens on different ports and uses different URLs for receiving AS2 transmissions than earlier releases. After you import your profiles into ArcESB, you must update your trading partners so that they are sending to your new Receiving URL.

By default, the server provided with ArcESB listens in plaintext on port 8001 and uses SSL/TLS on port 8401. You can find the Receiving URL by clicking Profile > AS2


  • Transition trading partners at their own pace.
  • No downtime.


  • Trading partners need to change your URL in the profile configuration on their end.
  • An additional port must be opened on the firewall.
  • Both versions of the application are maintained.

Using the Existing URL

To receive requests on the same URL that is used by the previous version, stop the server hosting the previous version so that the same port can be assigned to ArcESB. You also need to assign the server to the same port that you were using for the previous version. You can configure the port by right-clicking the icon in the system tray and then clicking Server Options. The application automatically recognizes requests to resources that were supported in previous versions of the application (/as2connector/pub/ReceiveFile.rsb and /Receiver.aspx, for instance) and forwards them to the appropriate resources in ArcESB.


  • Trading partners do not need to change profiles.
  • Maintain one system.


  • Downtime while old server is stopped to free up a port for the new server.
  • Existing profiles must first be imported.

Note: If the port that you configure is an SSL/TLS-enabled port, you also need to configure the same SSL/TLS certificate that was used for the previous version of the AS2 Connector on this port. If you were previously hosting an SSL/TLS port in ArcESB, the same certificate store is the location of SSL/TLS certificates in ArcESB (the local machine’s personal account).

After you configure ArcESB to use the same port that you used in older versions of the application, you start receiving incoming transmissions at the folders configured above.

Upgrading an Amazon AMI

ArcESB 2021 has a dedicated AMI in the AWS Marketplace that can be used to create a new EC2 instance running Arc. In order to preserve all application data, please follow the instructions for copying application folders directly from the filesystem in our Back Up and Migrate ArcESB guide. To make a persistent copy of the relevant folders, they must be copied from the Amazon VM to a local machine via a transfer protocol like SFTP or SCP; then, the same folders must be transferred to the new EC2 instance created from the latest AMI.