Getting the error on accessing the vCenter server as "This site can't be reached"

Products

• VMware vCenter Server

Issue/Introduction

On accessing the vCenter server using the browser we get the error  "The site can't be reached".

Environment

vCenter Server Appliance  7.x

vCenter server Appliance 8.x

Resolution

1. Navigate to the ESXi host GUI your vCenter server resides on.
2. Log into the ESXi host as root user.
3. Open a VM console window to your vCenter Server Appliance VM. 
4. Log into the vCenter server Appliance in secure shell as root user. 
5. Check the status of all the services running on the vCenter server.

   • service-control --status --all

6. If the services are started successful , then test the curl commands.

   • curl -v https://<vCenter server FQDN>:443
     curl -iv https://<vCenter serverFQDN>:443

7. Check if the proxy is enabled on the vCenter server.

   • cat /etc/sysconfig/proxy

8. If the proxy is  configured, test the connectivity to the proxy server. If the communication fails, disable the proxy by updating the parameter in the /etc/sysconfig/proxy file.

   • PROXY_ENABLED="yes"  to PROXY_ENABLED="no"

9. How to check the proxy configuration and incase you are using single port 3128 then follow the steps mentioned in 

   Confirm the vCenter Server Appliance Proxy settings

10. vCenter server should be able to ping its default gateway, if the ping fails kindly check the firewall rules.