KB ID 0001711
I updated my vCenter to 188.8.131.52100 yesterday, and since then every time I tried to login to the HTML5 web client, it authenticated, let me in, showed me the error (below), then kicked me out again?
I assumed, (wrongly) that the upgrade had overwritten the webclient.properties file that controls timeouts. this may be you problem, see the following article If my ‘fix’ does not work for you.
In the end my fix was quick and simple, go to add/remove programs and locate the vSphere Enhanced Authentication Plugin (in my case version 6.5.0) and uninstall it.
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