java - "Received message is too long" when connecting to SFTP server with JSch -


i wanted download files using ftp server. can through command-line , want same thing using java. code 

session = jsch.getsession(user, server, 22); session.setpassword(pass); session.settimeout(10000); java.util.properties config = new java.util.properties(); config.put("stricthostkeychecking", "no"); session.setconfig(config); session.connect(); channelsftp channel = (channelsftp) session.openchannel("sftp"); **channel.connect();** channel.disconnect(); session.disconnect();

problem when channel connecting i.e channel.connect , getting error:

com.jcraft.jsch.jschexception: 4: received message long: 1619214428     @ com.jcraft.jsch.channelsftp.start(channelsftp.java:242)     @ com.jcraft.jsch.channel.connect(channel.java:200)     @ com.jcraft.jsch.channel.connect(channel.java:144)     @ com.cca.processor.ftpprocessor.main(ftpprocessor.java:54) caused by: 4: received message long: 1619214428     @ com.jcraft.jsch.channelsftp.start(channelsftp.java:214)     ... 3 more

as commented yourself, cannot connect sftp client.

so there's nothing wrong jsch/java code.

the error occurs after ssh authentication, when sftp session starting.

it's typically caused startup shell script printing message, , breaking sftp protocol.

the number in error (1619214428) first 4 characters in message interpreted 32-bit number.

but in case not seem readable text (were it, winscp display readable form too). number stands ‭6083405c‬ in hexadecimal notation, <.(@ (where dot stands character outside of ascii table).

see winscp documentation error message:
https://winscp.net/eng/docs/message_large_packet

still, it's server broken, not code. should contact server administrator or review startup shell scripts of account.

though claim able use ftp command-line , winscp. maybe should use ftp (or better ftps), not sftp. cannot use jsch ftp (or ftps). can use apache commons ftpclient example.


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