[winswitch] Issue 270: Winswitch unable to connect over ssh from MS Windows to server running openssh 6.7

Fabian Ritzmann frtrack-winswitch at yahoo.com
Tue Aug 18 08:49:10 BST 2015


Since I am Trac-impaired (see my previous email to this mailing list), I am sending my comments via email. I was trying to connect from a MacBook with Winswitch 0.12.21-r5329 to an Arch Linux server running OpenSSH 7.0p1. The SSH server is refusing the connection with this error message:

sshd[20761]: fatal: Unable to negotiate with no matching key exchange method found. Their offer: diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1 [preauth]

This looks like the same issue that this Windows user reported in <https://winswitch.org/trac/ticket/270> with OpenSSH 6.7. The suggested work-around in the issue is to reenable the DH SHA1 key exchange, which I don't consider an option because it compromises security and exposes the host to the Logjam attack.

I would hope that this issue gets more traction because it is an issue with any secure installation of OpenSSH and not specific to the Windows Winswitch client.


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