Connecting to an ancient ESXi 5.5 SSH server

by James McDonald | Jul 6, 2026 | IT Tips | 0 comments

Unable to negotiate with 172.16.26.73 port 22: no matching MAC found. Their offer: hmac-sha1

ssh -Q mac

View your MACs
hmac-sha1
hmac-sha1-96
hmac-sha2-256
hmac-sha2-512
hmac-md5
hmac-md5-96
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[email protected]
[email protected]
[email protected]
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[email protected]
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Connect manually

ssh myESXi.toggen.local -l root -m hmac-sha1

Connect with config

Host myESXi
     HostName 172.16.26.73
     MACs hmac-sha1
     User root

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