If you have the "Invalid Login" or "Could not connect. Please check credentials of server." errors when you go to page of ESX ADDON please check to following steps for the solution;
1- Please check the root password of your vSphere Server on SERVERS page.
- Connect your vSphere server via SSH
- Open the sshd_config file with "vi" editor.
- Find the line that starts with PasswordAuthentication no and change the no to yes.
- Save the file and restart the sshd service with the command:
If this is not helpful for you please open a new ticket from here.