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"503 service unavailable" error when connecting to vSphere Web Client (2121043)

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  • Connecting to the vSphere Web Client ( fails.
  • You see entries similar to:

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

    • 503 Service Unavailable (Failed to connect to endpoint: [class Vmacore::Http::LocalServiceSpec:00000000006F92F0] _serverNamespace = /vsphere-client

    • 503 Service Unavailable (Failed to connect to endpoint: [N7Vmacore4Http20NamedPipeServiceSpecE:0x7f0c6005e4c0] _serverNamespace = / _isRedirect = false _pipeName =/var/run/vmware/vpxd-webserver-pipe)

    • 503 service unavailble fail to connect to end point.

    • 503 Service Unavailable (Failed to connect to endpoint: [N7Vmacore4Http16LocalServiceSpecE:0x7f65e7834610] _serverNamespace = /vsphere-client _isRedirect = false _port = 9090


Restart the vSphere Web Client manually and set it to Automatic to resolve the 503 Service Unavailable issue.


To resolve this issue:
  1. Verify that connectivity exists from the machine trying to access the vSphere Web Client to vCenter Server with telnet by running this command:

    telnet vcenter_fqdn 9443

  2. Ensure that vCenter Server services are running using this command (this can be ran on a Windows installation or Appliance):

    service-control --status --all

    Note: Before continuing, investigate if there are other services failing to start.

  3. Restart the vSphere Web Client manually from services.msc and set it to Automatic (delayed start). If the issue persist go to next step.
  4. From vCenter Server, investigate the vsphere_client_virgo.log file located at:

    • Windows vCenter Server - C:\ProgamData\VMware\vCenterServer\logs\vsphere-client\logs\
    • vCenter Server Appliance - /var/log/vmware/vsphere-client/logs/

      Also, look at the vpxd.log file located at:
      • Windows vCenter Server: C:\ProgramData\VMware\vCenterServer\logs\vmware-vpx
      • vCenter Server Appliance: /var/log/vmware/vpxd

  5. Compare the logs to these knowledge base articles to see if this is a known issue:

See Also

Request a Product Feature

To request a new product feature or to provide feedback on a VMware product, please visit the Request a Product Feature page.


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  • 127 Ratings