TN3270 Plus Security Alert

Important Notice!

Dear SDI Customers,

We regret to inform you that as of 9/26/2025, SDI USA has ceased all operations. Due to the lack of sufficient management structure and an aging workforce, we are no longer able to meet the high standard of support and service our customers deserve. As such, we have made the difficult decision to terminate our company's operation.

Licensed customers are authorized to continue using their licensed software products without further License or Maintenance and Technical Support fees. However, no Technical Support services will be available. The software products affected by this change include TN3270 Plus, SDI LPD, and any other software licensed by SDI USA in the past. There will be no future product updates, no new releases, and no new licenses. The products should continue to perform their intended function until changes to the operating environment make it incompatible with our products. Feel free to continue using the products for no cost until you decide to move to another supplier.

We intend to keep the sdisw.com website available, but unmonitored until 12/31/2026. We recommend that you download the installation files, user guides and sample files and keep them in a safe place for your future use before the web site closes down.

We have witnessed monumental changes in the computer software industry during the past fifty plus years and have enjoyed working with so many outstanding companies and wonderful people over those years. We wish you all a prosperous future.

SDI USA

TN3270 Plus Security Alert for OpenSSL

OpenSSL Security Problem and Fix

TN3270 Plus uses OpenSSL software to provide encryption for the TN3270 Plus SSL feature.

On March 19, 2015, the OpenSSL Organization posted a Security Advisory. The Security Advisory contains issues that could affect TN3270 Plus users. You can see the Advisory on the following web page.

http://www.openssl.org/news/secadv_20150319.txt

OpenSSL has corrected these issues and released a new version of the OpenSSL software containing the updates. SDI has incorporated the new version of OpenSSL in TN3270 Plus release 4.0.1 and higher.

Affected TN3270 Plus Versions

The OpenSSL security issue affects TN3270 Plus release 4.0.0 or earlier with the SSL feature.

TN3270 Plus users with the SSL feature should update to TN3270 Plus release 4.0.1 or higher immediately. You can download most current TN3270 Plus Release from the following web page.

http://sdisw.com/download.aspx

TN3270 Plus Update Details

TN3270 Plus Release 4.0.1 and higher is free to customers that subscribe to our maintenance and support plan. Customers that do not have a maintenance and support subscription should email sales@sdisw.com and request a quote to purchase a maintenance and support subscription.

TN3270 Plus release 4.0.1 or higher may be installed over the top of the existing TN3270 Plus release. Release 4.0.1 or higher will honor all the existing configuration settings and users will not need to make any changes to their procedures. Users should email support@sdisw.com and request a release 4.0 license code. If you already have a release 4.0 license code it will work with releases 4.0.1 up to and including 4.0.9.

TN3270 Plus releases 4.0.0 and above do not support SSL version 2 and SSL version 3 you must use TLS version 1, TLS version 1.1 or TLS version 1.2.

If you have questions or concerns please e-mail support@sdisw.com.

Previous Security Alerts