Hello
More details are required such as version and build of the ESXi Host. If you have a vCenter Server, version and build are also required.
Is your vcenter server physical or virtual?
Can you connect to the vCenter Server and the ESXi Host with the vSphere client?
Can you connect to the ESXi Host with the vSphere Web Client ?
You cannot connect to the vcenter server with the vSphere Web Client ?
In versions 6.5 and 6.7 we have 2 clients to connect to the vcenter server or ESXi Host:
vSphere web client (Adobe Flash)
vSphere client (HTML5)
https://ip_address/ui access with vSphere web client (Adobe Flash)
https://ip_address/vsphere-client access with vSphere cliente (HTML5)
Which of the two ways do you connect ?
There is some confusion because of the similar names VMware used for its different connection clients in the different versions of VMware.
Personally I use the following combination, but only to manage VMware, to surf the internet I use a more current browser.
Firefox ESR 38.8 (32bits)
Adobe Flash player 29.0.0.113
Both the browser and the flash player must be configured so that they are never updated.