I saw the log said " com.vmware.vim.sso.client.impl.SecurityTokenServiceImpl$RequestResponseProcessor: Server returned 'request expired' less than 0 seconds after request was issued, but it shouldn't have expired for at least 600 seconds." for these login request. According to KB at http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2038086
You may need to update the locale time of vc server. Please have a try according to this KB, and see if it works.
Thanks,
Jun