Okay so you are getting an SSL error. You can just click continue to get past the error and still be able to work with the host to do most things (Except maybe file transfers). But if you do not want to see it, here is what you need to do:
This will work for Internet Explorer
If you just installed ESXi then I would recommend clicking the continue on "Not Recommended" to get to the ESXi welcome screen. In the lower right hand corner you should see a link to download the root CA. Download it and install it in your Trusted Root Certificate Authorities folder. Close out IE and reopen it and go back to the ESXi Web page using the DNS Name and you will no longer get the certificate error.
You will also have to perform similar steps with vCenter unless you are going to use a VMCA which will then replace the SSL Certificates on your ESXi Host.
Okay, So that message you are getting does not look like the SSL Error page. If it was a certificate issue it would look like this:
Now I am not able to read Spanish, but from what I am able to Google Translate, it looks like the message your are getting has to do with the level of encryption that you have enabled in your IE. I would check under internet options and look at the following check boxes
It could be that you have SSL 3.0 Enabled or something like that.
Try clicking the Restore Advanced Settings button and close and reopen IE and let me know if that works.
Also do you get the same message if you use a different web browser? Firefox, Chrome?
Since this is a new build, is there a reason why you are using an build image from 11-15-2016?
I am betting if you can update it to at least ESXi 6.5 U1 Build number 5969303 you would have less issues. If your hardware supports it I would recommend going up to at least one of the ESXi 6.5 U2 builds.
You should be able to do an in-place upgrade of the host you already built, or you can start fresh with the newer build.