One of my vCenter servers constantly has a problem loading the Web Client. The thick vSphere Client works fine, but when I go to the web client, it never loads the site. To fix this, I ssh into the VCSA and run the following.
service-control --stop vsphere-client
service-control --start vsphere-client
After restarting the vsphere-client, the web client then works fine until it stops working again which could be a week or two.
It seems like this started happening when setting up Linked Mode with two other sites. Oddly, the other two sites never seem to experience this problem, and if I log into the two working sites, all three vCenters are accessible. So it only appears to be an issue with the Web Client on the first site. All sites are running 6.0 and mostly up to date with an external PSC each. This has been going on for about a year, and I always hope that installing the latest update will resolve the problem, but it doesn't. Given the issue, I am worried about upgrading to 6.5 since it is all web based.
I tried VMware support, but they call to troubleshoot at the most random times and would never schedule a time with me.