"Algorithm negotiation fail" error after an upgrade of Enterprise Server to 3.5.4 from an older version on Windows

Issue

The following connection error might occur after upgrading your server or Point to Point client from versions older than 3.5.4 on Windows, or if you had leftover files from previous installs:

 

algorithm_negotiation (1).jpg

Environment

  • Product: Enterprise Server, Connect Server, Point to Point
  • Version: Upgrade from earlier version to 3.5.4
  • Operating System: Windows

Solution

In order to resolve the issue, locate sshd_config which may be found in locations such as:

  • C:\Program Files (x86)\Aspera\Client\etc
  • C:\Program Files (x86)\Aspera\Point-to-Point\etc

Open the file in a text editor and add the following line:

KexAlgorithms diffie-hellman-group1-sha1

Finally, restart your ssh service. For instructions on how to do this, visit this article (Restarting ssh service on Windows).

You should now be able to connect successfully with the server or client.

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