Managing Connections

Add and manage remote FASP servers.

To connect to a remote computer or to a server in the cloud, you need to add it to the Connection Manager before establishing the connection. If you are planning to perform transfers with an S3 bucket, you must meet the following prerequisites:

Start the application: asperascp. In the upper-right corner, click Connections to open the Connection Manager.

Click the Connections button.

In the Connection Manager, click Add connections to create a new connection. You can also use Duplicate connections to duplicate a selected connection (i.e. copy all information into a new profile) and Remove connections to delete a connection profile.

To name or rename a connection, click the orange connection profile name that appears at the top of the screen. The Rename Connection dialog appears. You can also launch the Rename Connection dialog by clicking once on an already selected connection name in the left panel of the Connection Manager. When you have entered the new name, save it by clicking OK (once in the Rename Connection dialog and again in the Connection Manager).

The Connection Manager includes the following configuration tabs:

Tab Description
Connection The basic host information, such as the address, login credentials, and connection ports.
Transfer The transfer session-related options, such as the transfer speed and retry rules.
Tracking Options for tracking the transfer session, including the confirmation receipt and the email notifications.
Filters Create filters to skip files that match certain patterns.
Security Enable the transfer encryption and the content protection.
File Handling Set up resume rule, preserve transferred file attributes, and remove source files.

The following tables detail all options in these tabs:


Option Description
Host Required The server's address, such as or
User The login user for the server.
Authentication Choose either password or public key for authentication. To use the key-based authentication, see Creating SSH Keys.
Storage Type

Use this drop-down menu to configure storage in the cloud. Note that the default option is local storage.

Storage types include the following:

  • Akamai NetStorage
  • Amazon S3: Once selected, you will be required to input your Access Id / Secret Access Key and identify a bucket. Note that the local machine must be reasonably time-synchronized in order to communicate with the Amazon servers. You can also select the Advanced button to modify the following settings:
    • Host: Amazon S3 hostname (default:
    • Port: Default is port 443.
    • HTTPS connection for file browsing: Enable for secure browsing.
    • Server-side file encryption: Enable for AES256 encryption.
    • Reduced redundancy storage class: Assign objects to a to the "reduced redundancy" storage class (durability of 99.99%).
  • Google Storage
  • Limelight
  • OpenStack Swift
  • Windows Azure
  • Windows Azure SAS

Note: You can only choose special storage if you have full access to that storage on the cloud-based machine.
Target Directory The default directory when connecting to this computer. When leaving it blank, browsing the remote host brings up either the user account's document root (docroot), or the last-visited folder; when specifying a path, connecting to the host always brings up the exact directory. The default directory is shown in the Connections panel.
Share this connection ... Check this box to share this connection with other users on your computer. When a connection is authenticated through Public Key, the SSH keys used by this connection should be shared as well. Refer to Creating SSH Keys.
Advanced Settings > SSH Port (TCP) The TCP network port. Default: 33001. Note that if connecting on 33001 fails, the application attempts to establish a connection on port 22. If the connection on 22 succeeds, the setting is updated to 22.
Advanced Settings > fasp Port (UDP) The UDP network port: Default: 33001.
Advanced Settings > Connection Timeout Time out the connection attempt after the selected time.
Test Connection Click this button to test the connection to the remote server with the settings you configured. An alert box opens and reports whether the connection is successful.


Option Description
Transfer Name Choose between the following option: Automatically generate allows the user interface to generate the transfer name; Automatically generate and add prefix uses auto-generated name with prefix; Specify uses the user-specified name.
Policy Select the FASP transfer policy.
  • fixed – Attempts to transfer at the specified target rate, regardless of the actual network capacity. This policy transfers at a constant rate and finishes in a guaranteed time. This policy typically occupies most of the network's bandwidth, and is not recommended in most file transfer scenarios. In fixed mode, a maximum (target) rate value is required.
  • high – Monitors the network and adjusts the transfer rate to fully utilize the available bandwidth up to the maximum rate. When congestion occurs, a it transfers at a rate twice of a session with fair policy. In this mode, both the maximum (target) and the minimum transfer rates are required.
  • fair – Monitors the network and adjusts the transfer rate to fully utilize the available bandwidth up to the maximum rate. When other types of traffic build up and congestion occurs, it shares bandwidth fairly by transferring at an even rate. In this mode, both the maximum (target) and the minimum transfer rates are required.
  • low – Similar to fair mode, the low policy uses the available bandwidth up to the maximum rate, but is much less aggressive when sharing bandwidth with other network traffic. When congestion builds up, the transfer rate is reduced to the minimum rate until other traffic retreats.
Speed Check this option to specify the transfer rate. The target rate is constrained by the global bandwidth in the Preferences window. Refer to Global Bandwidth Settings.
Retry Check this option to automatically retry the transfer after a recoverable failure. When checked, set the amount of time the transfer should be retried in seconds, minutes or hours. You may set the initial and maximum retry intervals by clicking the More Options... button.
  • Initial interval: The first retry waits for the initial interval. Input in seconds, minutes or hours.
  • Maximum interval: After the initial interval, the next interval doubles until the maximum interval is met, and then stops retrying after the retry time is reached. Input in seconds, minutes or hours.

Example 1:

10s initial interval, 60s maximum interval, retry for 180s
Retry at (seconds): 10s 30s 70s 130s 180s
Interval progression (seconds): 10s 20s 40s 60s 60s 50s

Example 2:

30s initial interval, 120s maximum interval, retry for 600s
Retry at (seconds): 30s 90s 210s 330s 450s 570s 600s
Interval progression (seconds): 30s 60s 120s 120s 120s 120s 30s
Show Advanced Settings Click the Show Advanced Settings button to reveal the following options:
  • Specify FASP datagram size (MTU): By default, the detected path MTU is used. Once you enable this checkbox, you can specify a value between 296 and 10000 bytes.
  • Disable calculation of source files size before transferring: By enabling this checkbox, you can turn off the job size calculation on the client-side (if allowed by the server).


Option Description
Generate delivery confirmation receipt Check the option to create the delivery receipt file in the specified location.
Send email notifications Send out email notifications based on specified events (start, complete, and error). Refer to Using Transfer Notifications for more information.


Click Add and enter the pattern to exclude files or directories with the specified pattern in the transfer. The exclude pattern is compared with the whole path, not just the file name or directory name. Two special symbols can be used in the setting of patterns:

Symbol Name Description
* Asterisk Represents zero to many characters in a string, for example *.tmp matches .tmp and abcde.tmp.
? Question mark Represents one character, for example t?p matches tmp but not temp.


Filter Pattern Matched files
*dirName path/to/dirName, another/dirName
*1 a/b/file1, /anotherfile1
*filename path/to/filename, /filename
path?/file? path1/fileA, pathN/file5


Option Description
Encryption When checked, FASP encrypts files while transferring. Encryption may decrease performance, especially at higher transfer speeds and with slower computers.
Content Protection Two options: Encrypt uploaded files with a password encrypts the uploaded files with the specified password. The protected file has the extension .aspera-env appended to the file name; Decrypt password-protected files downloaded prompts for the decryption password when downloading encrypted files.

File Handling

Option Description

Check Resume incomplete files to enable the resume feature. Under When checking files for differences, choose from the following options:

  • Compare file attributes only checks whether the existing file is the same size.
  • Compare sparse file checksums performs a sparse checksum on the existing file.
  • Compare full file checksums perform a full checksum on the existing file.

Under When a complete file already exists at the destination, select an overwrite rule when the same file exists at the destination.

File Attributes
  • Enable the Preserve Access Time checkbox to set the access time of the destination file to the same value as that of the source file.
  • Enable the Preserve Modification Time checkbox to set the modification time of the destination file to the same value as that of the source file.
  • Enable the Preserve Source Access Time checkbox to keep the access time of the source file the same as its value before the transfer.

Note: Access, modification, and source access times cannot be preserved for node and Shares connections that are using cloud storage.

Source Deletion Check Automatically delete source files after transfer to delete successfully transferred files from the source. Check Delete empty source subdirectories to also remove empty folders (except a folder specified as the source to transfer).
Source Move To move source files to a separate location after a successful transfer, check Automatically move source files to a directory after transfer and specify the location.

Note: Only a path to an existing location on the client can be specified.

Note: The GUI has no option to delete empty source subdirectories that may remain after source files are moved.

Important: When managing connections, changes are not saved until you click OK. Selecting Cancel will discard any unsaved changes made in the Connection Manager, including the addition and removal of connections.

To connect to this remote host, double-click the connection from the Connection panel, or select it and click Connect.

Select a connection.

Importing and Exporting Connections

You may also import your connection list to and export your connection list from a text file. To export your connection list, right-click the remote server panel and select Export. To import your connection list, right-click the remote server panel and select Import. Both options are shown below (with "export" selected).

  • If you are exporting a connection that uses keys, then you will need to back up those keys manually and import separately.
  • A shared connection that is exported and imported by a non-administrator will import as a regular connection (not as shared).
  • Email templates are not exported with the connection.