I found this error in the forum but the solutions provided (old dll version and too many connections) don't apply to my situation. Is there another possible solution or some info i can take back to the admin of the site.
ChilkatLog: InitializeSftp: DllDate: Jan 19 2012 Architecture: Little Endian; 32-bit Language: .NET 2.0 SshVersion: SSH-2.0-OpenSSH_4.3 SftpVersion: 0 hcCurDate: Fri, 14 Sep 2012 08:37:01 -0400 hcExpire: 4/2012 channelType: session clientChannel: 0 initialWindowSize: 327680 maxPacketSize: 32768 Sent open channel request ClientChannelNum: 0 ServerChannelNum: 0 ServerInitialWindowSize: 0 ServerMaxPacketSize: 32768 Session channel successfully opened. ChannelNum: 0 ServerChannelNum: 0 Sent subsystem request Received SUCCESS response to subsystem request. Sent FXP_INIT Received EOF Failed to receive FXP_VERSION Failed. --InitializeSftp --ChilkatLog
The "DllDate" within your LastErrorText shows "Jan 19 2012", which mean you're not actually using the very latest version. (Maybe the Chilkat assembly is being loaded from the GAC?) In any case, download the latest version, or if you wish, you can grab the latest from here: http://www.chilkatsoft.com/preRelease/ChilkatDotNet2.zip (which is a stable, production-ready build.)
Also, I found this after Googling "sftp server closed connection unexpectedly"
1) Your account may not be able to start SFTP server binary (e.g. /bin/sftp-server) or the binary is not present on your server.
2) Your SSH server may also lack the SFTP subsystem.