Interesting! It hasn't happened again, but will keep this in mind. Thanks so much...
From: Mihai Moldovan <io...@ionic.de> To: jmmec2...@yahoo.com; "x2go-user@lists.x2go.org" <x2go-user@lists.x2go.org> Sent: Monday, February 27, 2017 6:48 AM Subject: Re: [X2Go-User] X2Go Client: Kex error : no match for method server host key alog: server [ssh-rsa], client [ssh-ed25519] On 24.02.2017 01:14 AM, jmmec2...@yahoo.com wrote: > I don't know why Windows 8.1 was suddenly only supporting ssh-ed25519 and > failing to connect to my Linux Mint session with that "kex error". What is > even > stranger: the problem suddenly went away and I could once again use the x2go > client to connect to that session (the same session that I've had running for > more than a month - maybe two months by now). At least for now the "kex > error" > is gone with the X2GO client. Stefan just had the same problem. Then it struck me - he's using DHCP in his network and IP addresses of virtual machines often get reassigned addresses based on which ones are free (hence the addresses are only pseudo-static.) He tried to connect to a CentOS 5 box and got the same error. The problem was that this exact host was already recorded in his known_hosts file with an ED key - this is why libssh advertised only knowing ED-type keys. After moving the known_hosts file out of the way, the connection was established okay. In general a little bit less weird, though, as in his output the server advertised both RSA and DSA keys, like you'd expect of a CentOS 5 machine. A similar thing probably happened to you. Mihai
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