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503 Service Unavailable error


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Hello, @darkhorse!

Various factors can cause 503 Service Unavailable error:

  • Some services aren't loaded yet, and as a result, they aren't running (for example, the reverse Proxy or vSphere web client service can be down).
  • vCenter Server can be on maintenance
  • vCenter Server can be overloaded
  • There can be some disk issues on the vCenter server
  • The problem can be with a database used by vCenter
  • There can be network issues

Note: You can't fix the error on the client side. Instead, do that on the vCenter server. Please find the detailed guide on how to resolve any possible issue in our blog post https://www.nakivo.com/blog/503-service-unavailable-error-on-the-vsphere-web-client/

Let me know if you need any further help with your issue.

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