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An expansion of the 400 Bad Request response code, used when a client certificate is required but not provided. 497 HTTP Request Sent to HTTPS Port. An expansion of the 400 Bad Request response code, used when the client has made a HTTP request to a port listening for HTTPS requests. 499 Client Closed Request.
List of FTP server return codes. FTP server return codes always have three digits, and each digit has a special meaning. [1] The first digit denotes whether the response is good, bad or incomplete: Range. Purpose. 1xx. Positive Preliminary reply. The requested action is being initiated; expect another reply before proceeding with a new command ...
Google services outage. During eight episodes, one in 2013, one in 2014, one in 2018, three in 2020, and two in 2022, Google suffered from severe outages that disrupted a variety of their services. The first was a five-minute outage of every Google service in August 2013. The second was a 25-minute outage of Gmail, Google+, Google Calendar, and ...
When you get a message from a "MAILER-DAEMON" or a "Mail Delivery Subsystem" with a subject similar to "Failed Delivery," this means that an email you sent was undeliverable and has been bounced back to you.
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One way around this is to find 404 errors by analyzing external links. One of the most effective ways to discover 404 errors is by using Google Search Console, Google Analytics or crawling software. Another common method is tracking traffic to 404 pages using log file analysis.
X.2.XXX Mailbox Status. X.3.XXX Mail System Status. X.4.XXX Network and Routing Status. X.5.XXX Mail Delivery Protocol Status. X.6.XXX Message Content or Media Status. X.7.XXX Security or Policy Status. The meaning of the "detail" field depends on the class and the subject, and are listed in RFC 3463 and RFC 5248 .
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