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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 did not understand an event package specified in an Event header field. [4]: §7.3.2 [6]: §8.3.2 491 Request Pending Server has some pending request from the same dialog. [1]: §21.4.27 493 Undecipherable Request contains an encrypted MIME body, which recipient can not decrypt. [1]: §21.4.28 494 Security Agreement Required
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 ...
If you're having problems sending mail, there are a few troubleshooting steps you can take to fix the problem. Restart your computer:. If you haven't shut down your computer in a while, we recommend that you begin troubleshooting by restarting your computer.
Status codes are issued by a server in response to a client's request made to the server. Unless otherwise stated, all status codes described here is part of the current SMTP standard, RFC 5321. The message phrases shown are typical, but any human-readable alternative may be provided.
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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