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2 reasons why you get "530 Login authentication failed" in your cPanel Pure-ftpd server and how to fix it
FTP: The remote server returned an error: (530) Not logged in. · Issue #2508 · microsoft/BotBuilder-Samples · GitHub
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Exchange does not accept any email from POPcon. Error message: "530 5.7.0 Must issue a STARTTLS command first"
Error 530, Could not connect to server" when trying to connect to Xenta Server with FTP - Schneider Electric Community
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