HTTP 5xx Server Error Codes (IIS 6.0)
Error codes in the 5xx range indicate server problems. Table 11.9 HTTP 500-Class Client Error Codes Returned by IIS lists the HTTP 5xx-class codes that IIS returns. The descriptions for most codes are self-explanatory. When additional information about a code is required, it is provided in one of the following sections.
Internal server error.
Header values specify a configuration that is not implemented.
HTTP version not supported.