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3.1.5.2.3 HTTP Error 503

One of the causes of HTTP error 503 is that more users than are allowed by the server's request queue limit have sent requests to a single server.

The error returned by the server resembles the following.

OPTIONS /Microsoft-Server-ActiveSync
Content-Type: application/vnd.ms-sync.wbxml
MS-ASProtocolVersion: 14.0

HTTP/1.1 503 Service Unavailable
Connection: close
Date: Mon, 02 Mar 2009 23:51:51 GMT
Server: Microsoft-IIS/7.0
X-Powered-By: ASP.NET
Content-Type: text/html

If a Retry-After header ([RFC2616]) is present in the response, the client SHOULD<5> retry the request after waiting the number of seconds indicated by the Retry-After header. Any such value represents an estimate of when the server is expected to be able to process the request.

If a Retry-Header is not present in the response, the client can retry the request after waiting a few seconds. The time to wait between continuous requests that result in HTTP error 503 responses can be increased exponentially to a predetermined maximum.

For more details about ASP.NET performance monitoring properties, see [MSDN-APM].

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