FTP response 421 received. Server closed connection
現象： 在springboot的定時器輪詢去下載ftp文件時，報以下錯誤： org.apache.commons.net.ftp.FTPConnectionClosedException: FTP response 421 received. Server closed connection ...
原文：Connection closed before full header was received
Flutter的Dio報錯： Connection closed before full header was received 可以檢查一下是不是端口有問題。 同事把端口設置為 ，就報告這個錯誤。換個端口就好了。 是SqlServer的端口，因此有是可能APP連接到別人的應用服務器上了。 ...
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