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.
2- If all things are correct and you still have a same issue please change the a line in sshd_config file;
If this is not helpful for you please open a new ticket from here.
- Connect your vSphere server via SSH
- Open the sshd_config file with "vi" editor.
vi /etc/ssh/sshd_config
- Find the line that starts with PasswordAuthentication no and change the no to yes.
PasswordAuthentication yes
- Save the file and restart the sshd service with the command:
/etc/init.d/sshd restart
If this is not helpful for you please open a new ticket from here.