Accessing the ESXi host through the Host Client UI fails with error: "503 Service Unavailable"

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VMware vSphere ESXi VMware vSphere ESXi 6.0

After upgrading from ESXi 5.x to ESXi 6.0 or later, you experience these symptoms:

Logging in or accessing the ESXi host through the Host Client UI fails.
You see an error similar to:

503 Service Unavailable (Failed to connect to endpoint: [N7Vmacore4Http16LocalServiceSpecE:0x1f0daf08] _serverNamespace = /ui _isRedirect = false _port = 8308).

VMware vSphere ESXi 6.5
VMware vSphere ESXi 6.0
VMware vSphere ESXi 6.7

Log in to the affected ESXi host via root user through SSH.
Take a backup of the /etc/vmware/rhttpproxy/endpoints.conf file by running this command:

cp /etc/vmware/rhttpproxy/endpoints.conf /etc/vmware/rhttpproxy/endpoints.bkp
Open the endpoints.conf file using a text editor. For more information on using a text editor, refer Adding/Deleting/Editing a host entry on vCenter server or ESXi host using vi editor

For example:

vi /etc/vmware/rhttpproxy/endpoints.conf
Delete the entry "/ui local 8308 redirect allow" from the endpoints.conf file.

For example, delete the highlighted entry from the endpoints.conf file:

/ local 8309 redirect allow
/cgi-bin local 8309 redirect allow
/client/clients.xml local 8309 allow allow
/fdm local 9089 reject allow
/folder local 8309 redirect allow
/guestFile local 8309 redirect allow
/ha-nfc local 12001 allow allow
/host local 8309 redirect allow
/mob namedpipe /var/run/vmware/proxy-mob redirect allow
/mobfdm local 9090 redirect allow
/nfc local 12000 allow allow
/screen local 8309 redirect allow
/sdk local 8307 redirect allow
/sdkTunnel namedpipetunnel /var/run/vmware/proxy-sdk-tunnel allow reject
/tmp local 8309 redirect allow
/ui local 8308 redirect allow
/vpxa local 8089 reject allow
/wsman local 8889 redirect allow
Type :wq! to Save and close the endpoints.conf file.
Restart the rhttpproxy service by running this command:

/etc/init.d/rhttpproxy restart

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