Hello! I've been having a great time with ftpserver. I've been developing a toy tool just for learning and some work related stuff. All good with it.
But recently I needed to add FTPS support to it and I can't make it work. To pinpoint the problem, I will use the EmbeddingFtpServer.java[1] example. It is simply not working for me. It throws some exceptions that I'll show below. Does the same happen to you? Is there something am I missing? Thank you very much! # Environment As the "Embedding" guide[2] tells, this is the list of jars I have in my classpath: - ftplet-api-1.1.1.jar - ftpserver-core-1.1.1.jar - mina-core-2.0.21.jar - slf4j-api-1.7.31.jar - slf4j-simple-1.7.31.jar I'm running Ubuntu Linux 20.04.2 LTS I'm managing Java with SDKMAN. The java version is: openjdk version "11.0.11" 2021-04-20 OpenJDK Runtime Environment AdoptOpenJDK-11.0.11+9 (build 11.0.11+9) OpenJDK 64-Bit Server VM AdoptOpenJDK-11.0.11+9 (build 11.0.11+9, mixed mode) The javac version is: javac 11.0.11 # The Stacktrace This is part of the full log and stack trace I'm pasting in this link[3]. ```plain [main] INFO org.apache.ftpserver.impl.DefaultFtpServer - FTP server started [NioProcessor-3] INFO org.apache.ftpserver.listener.nio.FtpLoggingFilter - CREATED [pool-3-thread-1] INFO org.apache.ftpserver.listener.nio.FtpLoggingFilter - OPENED [pool-3-thread-1] WARN org.apache.ftpserver.listener.nio.FtpLoggingFilter - EXCEPTION : javax.net.ssl.SSLException: Improper close state: Status = OK HandshakeStatus = NEED_WRAP bytesConsumed = 0 bytesProduced = 160 sequenceNumber = 0 ... [pool-3-thread-1] ERROR org.apache.ftpserver.impl.DefaultFtpHandler - Exception caught, closing session javax.net.ssl.SSLException: Improper close state: Status = OK HandshakeStatus = NEED_WRAP bytesConsumed = 0 bytesProduced = 160 sequenceNumber = 0 ... [pool-3-thread-1] WARN org.apache.ftpserver.listener.nio.FtpLoggingFilter - EXCEPTION : javax.net.ssl.SSLHandshakeException: SSL handshake failed. ... Caused by: javax.net.ssl.SSLHandshakeException: No available authentication scheme ... [pool-3-thread-1] ERROR org.apache.ftpserver.impl.DefaultFtpHandler - Exception caught, closing session javax.net.ssl.SSLHandshakeException: SSL handshake failed. ... Caused by: javax.net.ssl.SSLHandshakeException: No available authentication scheme ... [pool-3-thread-2] INFO org.apache.ftpserver.listener.nio.FtpLoggingFilter - CLOSED [NioProcessor-4] INFO org.apache.ftpserver.listener.nio.FtpLoggingFilter - CREATED [pool-3-thread-1] INFO org.apache.ftpserver.listener.nio.FtpLoggingFilter - OPENED [pool-3-thread-1] WARN org.apache.ftpserver.listener.nio.FtpLoggingFilter - EXCEPTION : javax.net.ssl.SSLException: Improper close state: Status = OK HandshakeStatus = NEED_WRAP bytesConsumed = 0 bytesProduced = 160 sequenceNumber = 0 ... [pool-3-thread-1] ERROR org.apache.ftpserver.impl.DefaultFtpHandler - Exception caught, closing session javax.net.ssl.SSLException: Improper close state: Status = OK HandshakeStatus = NEED_WRAP bytesConsumed = 0 bytesProduced = 160 sequenceNumber = 0 ... [pool-3-thread-1] WARN org.apache.ftpserver.listener.nio.FtpLoggingFilter - EXCEPTION : javax.net.ssl.SSLHandshakeException: SSL handshake failed. ... Caused by: javax.net.ssl.SSLHandshakeException: No available authentication scheme ... [pool-3-thread-1] ERROR org.apache.ftpserver.impl.DefaultFtpHandler - Exception caught, closing session javax.net.ssl.SSLHandshakeException: SSL handshake failed. ... Caused by: javax.net.ssl.SSLHandshakeException: No available authentication scheme ... [pool-3-thread-1] INFO org.apache.ftpserver.listener.nio.FtpLoggingFilter - CLOSED ``` [1] https://gitbox.apache.org/repos/asf?p=mina-ftpserver.git;a=blob;f=core/src/examples/java/org/apache/ftpserver/examples/EmbeddingFtpServer.java;h=dc5a06d79d9e6aa4373b716d2f9f564aa0046df1;hb=HEAD [2] https://mina.apache.org/ftpserver-project/embedding_ftpserver.html [3] http://ix.io/3uoz
