vCenter Server not responding

Hi,
I have a VMware environment and it has been working great.
Just 5 minutes ago I tried to connect to the vCenter Server using the web interface and I can't connect.
The ping works, and the servers are running because the services are up and running.

So my question is, how can I troubleshoot this scenario?

Thanks.
cargexAsked:
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Justin StearCommented:
Can you give more information?  Can you connect using the vSphere Client?  What version of vCenter are you running?  Are you trying to connect via http or https?

Also, delete the cache in your browser.
Seth SimmonsSr. Systems AdministratorCommented:
i would restart the vcenter services
it will take several minutes so be patient
if after a while it still doesn't work, i would reboot the vcenter server
i experienced this before and a reboot clears it up
cargexAuthor Commented:
I'm running vSphere 6

Can't connect using vSphere Client
The URL I have been using all this time is
https://10.10.88.50/vsphere-client/?csp
comes back with classic "This page can't be displayed"
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cargexAuthor Commented:
And how exactly can I reboot the vCenter Sever if I can't connect to it.
Can you please walk me through the scenario?
Wayne88Commented:
You have to run SSH.  You can use application like PUTTY (Windows) to assist you with this task.

"To restart a vCenter Server Appliance service:

Connect to the vCenter Server Appliance through SSH. For more information, see Enable or Disable SSH Administrator Login on the VMware vCenter Server Appliance section in the vCenter Server and Host Management Guide.

Log in as root.

Run this command to review the list of all services:

ls /etc/init.d

Scroll through the output and find the name of the service you are interested in. For a list of core vCenter Server services, see the Additional Information section of this article.
Run this command in the SSH client:

service ServiceName restart

Where ServiceName corresponds to one of the services in /etc/init.d"

Stopping, starting, or restarting vCenter Server Appliance services (2054085):

http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2054085
Justin StearCommented:
Can you not RDP into the vCenter Server?  vCenter and ESXi are completey different.

Did you change the default port from 9443?
https://10.10.88.50:9443/vsphere-client/
Justin StearCommented:
@Wayne - By default SSH is disabled on the hosts, unless he manually turned on SSH all the time, he won't be able to SSH into the host.
cargexAuthor Commented:
Thank you very much guys.
It turns out it was a routing issue, but in any case you have open my eyes in regards to being prepared for a vCenter Server issue.

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Justin StearCommented:
May I ask what you did to fix the issue?  Were you able to SSH into the host?
cargexAuthor Commented:
In the end it was a routing issue.
I'm new here and for some reason the firewall was set as the gateway in the DHCP, and even though I was able to connect before all of the sudden I wasn't.
My solution was to change that in the DHCP server so that the gateway is now the Switch Stack, which is the one handling connectivity between the different vlans.
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