You can use SSH to remotely log in to the ESXi Shell and perform troubleshooting tasks for the host.

SSH configuration in ESXi is enhanced to provide a high security level.

Version 1 SSH protocol disabled

VMware does not support Version 1 SSH protocol and uses Version 2 protocol exclusively. Version 2 eliminates certain security problems present in Version 1 and provides you with a safe way to communicate with the management interface.

Improved cipher strength

SSH supports only 256-bit and 128-bit AES ciphers for your connections.

These settings are designed to provide solid protection for the data you transmit to the management interface through SSH. If this configuration is too restricted for your needs, you can lower security parameters.