This post talks about using PuTTY to log in to the switch board configured with management IP. Please have a look below to find more details.
1. According to the product documentation, configure the management IP address of the switch board. After the configuration, you can ping the management board from the physical PC.
2. Use the PuTTY tool to log in to the management IP; the error server's host key is invalid.
3. Check the version of the switch board. The command is display version and the version is Software Version V100R005C50. The version is too low.
4. Confirm that PuTTY has restrictions on the lower version. The default setting is not supported. You need to change the configuration. The Host keys option in the SSH option will advance the RSA option to the default selection. You can log in.

