Minor Release: IBM Aspera Enterprise Server 3.7.4 for Linux on z Systems

We are pleased to announce the release of IBM Aspera Enterprise Server version 3.7.4 for Linux on z Systems. This release provides a number of enhancements including support for transfers to Microsoft Azure Files, enhanced security, and numerous improvements to ascp, the Node API, and Watchfolder and Aspera Watch Service.




  • Enhanced FASP protocol performance improving overall throughput up to 100% over prior releases.
  • Transfers with Microsoft Azure Files are now supported, including using Azure Files access keys.
  • ASCP4 is now supported on Linux on z Systems. Aspera ASCP4 is an optimized transfer engine based on FASP technology and is designed for sending extremely large sets of individual files efficiently.

Security Enhancements

  • FASP transfers are more secure with upgraded OpenSSL (from 1.0.2i to 1.0.2j).
  • Increased server security with upgrades to the OpenSSH SSHD service.
  • File checksums SHA-256, SHA-384, and SHA-512 can now be used.
  • Improved detection of potential Distributed Denial of Service attempts involving missing or slow SSL negotiation requests.
  • Special file permissions (setuid and setgid) are now supported in ascp and the Node API.
  • Users can now specify multiple SSH private keys (both DSA and RSA keys) in the same ascp command.
  • SSH private key strings can now be used to authenticate ascp transfers by setting a new environment variable, ASPERA_SCP_KEY.


  • A new transfer scheme, faux://, enables testing a transfer without reading from disk and/or writing to disk, eliminating the need to generate large test sets.
  • Two new ascp options extend support for base64 encoding.
  • Ascp now features new complete include and exclude filter options to support glob and regular expression matching.
  • Ascp now includes a new asynchronous “in transfer” post-processing engine with Lua scripts.
  • Asperacentral has a new raw options capability that allows users to authorize the use of raw format ascp options in raw format.
  • A new FASP Manager API feature can be used to send an event when individual arguments, such as directories in persistent sessions, are completed.
  • Persistent ascp sessions (run with the --keepalive option) can now accept management control messages sent from a server to the remote machine.
  • The ascp management fields "User" and "ClientUser" now reflect the authorization and authentication methods.

 Node API

  • A new Node API call returns usage data (bytes transferred in, transferred out, and total) listed by usage_id or access key.
  • The Node API now returns events for the creation, rename, and deletion of files using the Node API, in addition to file transfer events.
  • A new Node API call returns verbatim the content of a file within the file size restriction set in aspera.conf.
  • The access key and token secret of a Node API user are now passed on to Aspera Central, such that ascp is run with the environment variables associated with that user.
  • SSH private key strings are now are now supported in the Node API through a new JSON element, ssh_private_key.
  • The /ops/transfers API has been improved, including new support for setting transfer rates, bandwidth priorities, and pausing/resuming/canceling active transfers.
  • The status of files and transfers can now be reported by iteration token from the Node API.
  • The Node API now supports access keys for IBM Bluemix S3 storage and Google Cloud Storage.

Watchfolder and Aspera Watch Service

  • Watchfolder uses two new APIs: asperarund and access_control.
  • New enhancements to the robustness of asperawatchfolderd, including the ability to initiate transfers with a destination root, allowing Watchfolder transfers to work using the Aspera upload option for Akamai storage.
  • Watchfolders can now use token authentication for transfers.
  • sers can now authorize the use of raw format ascp options by Watchfolder transfers.
  • Watchfolder can now retry failed drops.
  • Encryption-at-rest is now supported.
  • Faster directory scanning by the Aspera Watch Service, particularly of directories that contain many (10,000s) subdirectories.
  • Watchfolders now supports IPv6 addresses.
  • Watchfolder can delete files from the source as soon as the file is successfully transferred, rather than waiting for the session to complete.



This 3.7.4 release is available for download here. Aspera’s support team stands by ready to help you as needed with upgrades. If you have any questions or would like upgrade assistance, please contact support@asperasoft.com.


The release notes for IBM Aspera Enterprise Service 3.7.4 for Linux on z Systems can be found here.

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