Stack Exchange Network
Stack Exchange network consists of 183 Q&A communities including
Stack Overflow
, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.
Visit Stack Exchange
Unix & Linux Stack Exchange is a question and answer site for users of Linux, FreeBSD and other Un*x-like operating systems. It only takes a minute to sign up.
Sign up to join this community
Teams
Q&A for work
Connect and share knowledge within a single location that is structured and easy to search.
Learn more about Teams
I faced this issue on a server in another country. I changed mtu to values between 1200 and 1500 but nothing changed. I reinstall openssh but nothing happened. please help. tnx.Also forcing HostKeyAlgorithms to one algorithm did not helped. Also tested ssh from the server and it works fine. I think the problem is related to network parameters but I don't know what parameter should i change.
debug1: kex: algorithm: curve25519-sha256
debug1: kex: host key algorithm: ssh-rsa
debug1: kex: server->client cipher: [email protected] MAC: <implicit > compression: none
debug1: kex: client->server cipher: [email protected] MAC: <implicit > compression: none
debug3: send packet: type 30
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
I've had the exact same problem and have it solved this way:
Option 1 (one-time use):
At the comand line when submitting the SSH connect comnand, add "-oKexAlgorithms=ecdh-sha2-nistp521" parameter
Option 2 (definitive):
Add "KexAlgorithms=ecdh-sha2-nistp521" (with no quotes) on the corresponding ssh_config file
After adding below settings SSH started working
[root@RHELSERVER .ssh]# cat /root/.ssh/config
KexAlgorithms diffie-hellman-group18-sha512
