VMware vSphere/Hypervisor disconnected from vCenter

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Hypervisor is disconnected from vCenter and cannot be reconnected.

Login to hypervisor via ssh:

services.sh restart

Maybe also this explicitly:

/etc/init.d/hostd restart
/etc/init.d/vpxa restart
/etc/init.d/sfcb-watchdog restart

If the windows vsphere client doesn't work too, maybe there is a problem with the http-service:

/var/log/vpxa.log

Error fetching /sdk/vimService Versions.xml: 503 (Service Unavailable)

/var/log/rhttpproxy.log

2017-01-09T23:55:15.246Z verbose rhttpproxy[FFDBAB70] [Originator@6876 sub=Proxy Req 00009] Resolved endpoint : [N7Vmacore4Http16LocalServiceSpecE:0x1f0b7400] _serverNamespace = /sdk _isRedirect = false _port = 8307
2017-01-09T23:55:15.247Z warning rhttpproxy[FFDFCB70] [Originator@6876 sub=Default] Failed to connect socket; <io_obj p:0x1f0e4b34, h:13, <TCP '0.0.0.0:0'>, <TCP '127.0.0.1:8307'>>, e: system:111(Connection refused) 
2017-01-09T23:55:15.247Z warning rhttpproxy[FFDFCB70] [Originator@6876 sub=Proxy Req 00009] Connection to localhost : 8307 failed with error N7Vmacore15SystemExceptionE(Connection refused).

Fix your DNS :-)

KB Artikel:

https://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1014270