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SSH Error “no matching key exchange method found. Their offer: diffie-hellman-group1-sha1” when connecting to Cisco ASA from Linux

Software Effect Enterprises, Inc Posted on June 13, 2018 by SEEIJuly 6, 2021

Note – if you are getting this error, you really should update the ios or your equipment. But there are situations where that cant be done – so – Add the following lines to either the /etc/ssh/ssh_config file or the … Continue reading →

Posted in ASA, ssh

SSH WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!

Software Effect Enterprises, Inc Posted on December 22, 2019 by SEEIJanuary 3, 2020

You go to ssh to a system and you get the following message @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @ WARNING: POSSIBLE DNS SPOOFING DETECTED! @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ The ECDSA host key for server.domain.com has changed, and the key for the corresponding IP address 10.128.15.2 is … Continue reading →

Posted in Centos, Centos 6, Centos 7, ssh | Tagged host, remote, ssh

IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!

Software Effect Enterprises, Inc Posted on December 8, 2018 by SEEIDecember 8, 2018

You get the above message when running ssh. The issue is, you have connected to this host/ip in the past and the machine you are connecting to has been replaced and/or lots of updates have been done to it. If … Continue reading →

Posted in Centos, ssh

ssh fails to connect with debug1: expecting SSH2_MSG_KEX_ECDH_REPLY

Software Effect Enterprises, Inc Posted on November 11, 2018 by SEEINovember 11, 2018

Running ssh across a vpn connection I started having my ssh sessions fail to connect. After starting ssh with the “-vvv” option, the session would timeout after getting a debug1: expecting SSH2_MSG_KEX_ECDH_REPLY After doing some research, I found other people … Continue reading →

Posted in Centos, Centos 6, Centos 7, Cisco ASA, Linux, ssh
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