There may be a software version problem:
two solutions:
Solution 1. upgrade SecureCRT to the latest version, or use other connection tools
Solution 2. modify the server to make it compatible with the algorithm of the old system
after logging in to the server, use the following command in the server
vi /etc/ssh/sshd_config
#add the following text
KexAlgorithms [email protected],ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group14-sha1,diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1
#restart ssh
systemctl restart sshd.serviceRead More:
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