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504 5.5.4 Unrecognized authentication type [3] 521 Server does not accept mail [5] 523 Encryption Needed [6] 530 5.7.0 Authentication required [3] 534 5.7.9 Authentication mechanism is too weak [3] 535 5.7.8 Authentication credentials invalid [3] 538 5.7.11 Encryption required for requested authentication mechanism [3]
Usually, servers reject RCPT TO commands that imply relaying unless authentication credentials have been accepted. The specification recommends that servers issue 530 5.7.0 Authentication required in response to most commands in case the server is configured to require authentication and the client hasn't done it yet. Only servers listening on ...
The response must include a WWW-Authenticate header field containing a challenge applicable to the requested resource. See Basic access authentication and Digest access authentication. 401 semantically means "unauthenticated", the user does not have valid authentication credentials for the target resource. 402 Payment Required Reserved for ...
Add an extra security step to sign into your account with 2-step verification. Find out how to turn on 2-step verification and receive a verification code, and how to turn off 2-step verification if you need to.
Ident, authentication service/identification protocol, [11] [65] used by IRC servers to identify users Yes: Assigned: Authentication Service (auth), the predecessor to identification protocol. Used to determine a user's identity of a particular TCP connection. [66] 115: Yes: Assigned: Simple File Transfer Protocol [67] 117: Yes: UUCP Mapping ...
Strong customer authentication (SCA) is a requirement of the EU Revised Directive on Payment Services (PSD2) on payment service providers within the European Economic Area. The requirement ensures that electronic payments are performed with multi-factor authentication , to increase the security of electronic payments. [ 1 ]
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Editor's Note: This page is a summary of news on Pope Francis' health for Tuesday, Feb. 25. For the latest news, view USA TODAY's story on the pope for Wednesday, Feb. 25.. Pope Francis remained ...