Recently I have been spending a lot of time on the VMware Community forums just reading posts and helping out where I can. One of the threads that I helped out with had to do with how you can get rid of the pesky SSL Certificate error message you get every time connect to an ESXi host.
To resolve this issue you will need to add the Root Certificate for the ESXi host (the Certificate of the server who issued the certificate for the ESXi host) into the Trusted Certificate Authority Folder on your machine.
To start you need to go to the web page for the ESXi host
You will notice a few thing, first of all, I used an ESXi 6.0 host that I had in my lab and secondly you will see the RED background color in the address bar. You will need to click on the Certificate Error message as seen in the next picture.
From there you will get this pop up message
Click on View certificates to see the Client Certificate which is assigned to the host. You will then this the Certificate popup.
You will need to click on Certificate Path to see the CA
From here you will see all the Certificates in the Chain, in this case there are only 2
Click on the root certificate ( the one on the top of the chain) and click the View Certificates button to be able to see the certificate attributes.
A new Certificate window will open and you can click the Install Certificate Button to install it on your machine
This will open the Certificate Import Wizard.
You will need to click the Local Machine radio button and click next.
Select the Place all certificates in the following store
Click the Browse button to select where the certificate should be saved.
Select Trusted Root Certification Authorities and click OK
Click Next to Continue
Click Finish to exit the Wizard
You will then get this pop-up message, click OK to continue.
Click OK again
and click OK one more time
Then close out your Web Browser, reopen it and go back to the web page and you will no longer have red bar going across the screen.
I hope you find this helpful, I have a few more articles in the pipeline and I am working on getting out soon.