vCenter Server Appliance 6.5: 503 Service Unavailable

Martin 03/04/2017

After I installed the 5100 build of vCenter Server Appliance 6.5, and ran with it for 1 month, I suddenly could not connect to the Web Interface anymore, all I got was this:

“503 Service Unavailable (Failed to connect to endpoint: [N7Vmacore4Http20NamedPipeServiceSpecE:0x7f009c095810] _serverNamespace = / _isRedirect = false _pipeName =/var/run/vmware/vpxd-webserver-pipe)”

This is due to a bug in the appliance with duplicate entries in the postgres database, to get the info you need, login to the appliance with SSH:

Type “shell” for shell access and goto thos folder:


In here there is a lot of logfiles, they are all called postgresql-“dayofmonth”.log, so for the 2. day in the month, it would be “postgresql-02.log”,

Show this file with command:

“cat postgresql-02.log”

Look for this:

2017-04-02 18:07:21.974 UTC 58e13db9.11d2 1008636 VCDB vc ERROR:  duplicate key value violates unique constraint “pk_vpx_vm_virtual_device”

2017-04-02 18:07:21.974 UTC 58e13db9.11d2 1008636 VCDB vc DETAIL:  Key (id, device_key)=(8941, 4000) already exists.

Notify the ID and DEVICE_KEY, in this case, it’s 8941 and 4000

Now connect to db:

/opt/vmware/vpostgres/current/bin/psql -d VCDB -U postgres

To remove the duplicate key run the below command:

DELETE FROM vc.vpx_vm_virtual_device where id=’8941′ and device_key=’4000′;

“DELETE 1” = Means OK 🙂

Then quit the DB cli:


And type:


When the server reboots, all should be okay.

In my case, after reboot, I got the same error again, but when I looked into the logs, I had a new id that was duplicate, I deleted that, and rebooted, and after that, the VCSA was fine again 🙂

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