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Edit your SSH client configuration to allow the specific algorithms offered by the switch. Add KexAlgorithms=diffie-hellman-group1-sha1 to your SSH ...
Missing: fatal: ssh_dispatch_run_fatal: 115.239.252.248: [preauth]
Nov 26, 2022 · The error message will occur when the SSH Server and Client cannot agree on a mutual key exchange algorithm.
Missing: fatal: ssh_dispatch_run_fatal: 115.239.252.248:
May 2, 2023 · The error literally means that ssh server is able to negotiate with the above listed methods and your client has them disabled (most likely).
Missing: fatal: ssh_dispatch_run_fatal: 115.239.252.248:
Oct 30, 2015 · I'm now seeing lots of messages like these in the logs: sshd[19853]: fatal: Unable to negotiate with XXX: no matching key exchange method found.
Missing: ssh_dispatch_run_fatal: 115.239.252.248:
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Jun 5, 2016 · Trying to update CISCO SF200-24 boot code via SCP, but all I get is fatal: Unable to negotiate with <IP> port 5939: no matching key exchange method found.
Missing: ssh_dispatch_run_fatal: 115.239.252.248:
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