Please update Net::SSH dependency to version 2.5.2
The current version of Chef depends on Net::SSH 2.2.2 which only supports
limited HMAC algorithms for transport (MD5 and SHA1 family). For certain
clients, we require newer algorithms (HMAC SHA2 family), which are
supported in Net-SSH 2.5.2. Connecting to nodes, which have transport
HMAC limited to these algorithms is currently not possible.
Reference for available HMAC algorithms in Net::SSH: