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The server is unwilling to process the request because either an individual header field, or all the header fields collectively, are too large. [24] 451 Unavailable For Legal Reasons (RFC 7725) A server operator has received a legal demand to deny access to a resource or to a set of resources that includes the requested resource. [25]
The server is refusing to service the request because the Request-URI is longer than the server is willing to interpret. [1]: §21.4.12 415 Unsupported Media Type Request body in a format not supported. [1]: §21.4.13 416 Unsupported URI Scheme Request-URI is unknown to the server. [1]: §21.4.14 417 Unknown Resource-Priority
A server capable of replying with an Enhanced Status Code MUST preface (prepend) the Text Part of SMTP Server responses with the Enhanced Status Code followed by one or more spaces. For example, the "221 Bye" reply (after QUIT command) MUST be sent as "221 2.0.0 Bye" instead. [1]
Fix problems with image challenges when sending mail If you see an image challenge question when sending mail, you should just be able to complete the challenge then send mail. If, however, you correctly answer the image challenge and still can't send mail, it could be a sign of a more serious issue with your account, which may require ...
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If the proxy server is unable to satisfy a request for a page because of a problem with the remote host (such as hostname resolution failures or refused TCP connections), this should be described as a 5xx Internal Server Error, but might deliver a 404 instead.
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A rule of thumb in determining if a reply fits into the 4xx or the 5xx (Permanent Negative) category is that replies are 4xx if the commands can be repeated without any change in command form or in properties of the User or Server (e.g., the command is spelled the same with the same arguments used; the user does not change his file access or ...