Opened 8 years ago

Closed 7 years ago

#10836 closed Other (duplicate)

Error message - The first key-exchange algorithm supported by the server is diffie-hellman-group1-sha1, which is no longer secure. Aborting connection.

Reported by: Kwame Owned by:
Priority: normal Component: Other
Keywords: Key Exchange Algorithm Cc: k.mensah@…
Component version: Operating system type: Windows
Operating system version:


Dear Filezilla

I have recently upgraded to Filezilla version and now cannot connect to our FTP file server.

According to your site this error message means that the ftp/ sftp server needs to be upgraded to support a more secure key exchange algorithm.

The server is a Windows 2003 server. Would upgrading to either 2008 or 2012 rectify the problem? Or is there a Windows patch you are aware of?

We have an SSH Tectia server installed for SFTP; will this need to be upgraded also?

Many thanks for your help.

Kwame Mensah

Change History (2)

comment:1 by Kurt McKee, 7 years ago

Triage suggestion

This was discussed in ticket #10825 -- it appears that users must upgrade their FTP servers to mitigate vulnerabilities or downgrade their clients to continue using insecure algorithms.

I suggest closing this ticket as "wontfix".

@K.Mensah, it is possible that you could use FileZilla Server on your Windows server to resolve this problem. I am unfamiliar with what options are available with newer Windows versions or Windows patches. Unfortunately I am unable to recommend a specific path forward.

comment:2 by Tim Kosse, 7 years ago

Resolution: duplicate
Status: newclosed
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