SSH or WinSCP to ESXi host or vCenter Server fails with Couldn't agree a key exchange algorithm

Error: 

SSH or WinSCP connection to ESXi host or vCenter Server Appliance fails a message similar to:

Couldn't agree a key exchange algorithm (available: ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521, diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,)

Solution:

To resolve this issue, upgrade PuTTy to a version to 0.65 or later from http://www.putty.org/.