Open the Appliance Management Interface (for vCenter Server Appliance) in a web browser by entering the IP address or the FQDN (a Fully Qualified Domain Name) for vCenter and port 5480, for example:Ĭheck the status of vCenter services in the Services section. If this doesn’t help, check whether all needed services have started. Try connecting to vCenter from another client.

If you have just started a vCenter instance, and all the needed services have not started yet, wait for a few minutes and try again.

You should find and fix the error on the vCenter server and not on the client side. Incorrect firewall settings (for vCenter installed on Windows) and network issues.There are issues with a database used by vCenter.Some services have not loaded yet and are not running (one of the common issues is that the reverse Proxy service or the vSphere web client service is down).In the case of the vCenter 503 Service Unavailable error, the error can be caused by different factors: Here’s the full text of this error for VMware vSphere Client:ĥ03 Service Unavailable (Failed to connect to endpoint: _serverNamespace = / action = Allow _pipeName =/var/run/vmware/vpxd-webserver-pipe) Usually this error indicates that a server cannot handle a request and you should look for the issue on the web server hosting an application. Based on this, 503 Service Unavailable is a response that describes a server-side error. The 5xx class of HTTP status codes is used to notify users about server errors. 503 Service Unavailable is one of the standard HTTP status codes that are returned by a server when a client sends a request to the server. General Informationīefore covering troubleshooting, you should understand what the 503 error is. This blog post explains the possible reasons that can cause this error and the methods of fixing the vCenter 503 Service Unavailable error. Sometimes, when you try to open VMware vSphere Client to connect to vCenter, you get the 503 Service Unavailable error. VMware vCenter Server is a centralized vSphere management system that allows you to manage ESXi hosts, clusters, virtual machines, and other components of a virtual data center. By Michael Bose “503 Service Unavailable” Error on the vSphere Web Client: What Should You Do?

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