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Home > Success Center > Serv-U Managed File Transfer & Serv-U FTP Server > Error: SSH Protocol Error: invalid key exchange value

Error: SSH Protocol Error: invalid key exchange value

Created by Dhalia Turiaga, last modified by MindTouch on Jun 23, 2016

Views: 19 Votes: 0 Revisions: 5


SSH private key not working for DSA 4096 and 2048 on Serv-U version in 15.1.2 and 15.1.3


Serv-U version 15.x

  • Windows Vista/7/8, Server 2008/2012 - C:\ProgramData\RhinoSoft\Serv-U (Folder is Hidden in Windows by default)
  • Windows 2000/XP, Server 2000/2003 - C:\Program Files\RhinoSoft\Serv-U
  • Linux - /usr/local/Serv-U


Known bug using 15.1.2 and


DSA with key length 1024 is working for now when generating private key on Serv-U.

May also create or generate private key using third party application like PuttyGen. 




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