Bug report: lost SFTP connection transferring 64k file

Help & Support
1

I am getting a lost connection error message when filesize >= 65,536 bytes.
The same file will transfer successfully when filesize <= 65,535 bytes.

Edited SFTP log follows:

Opening Connection sftp.elink-filetransfer.com:22
Server version: SSH-2.0-Maverick_SSHD
We claim version: SSH-2.0-PuTTY-FZ-Local: Jan 10 2012 12:44:00
Using SSH protocol version 2
Doing Diffie-Hellman group exchange
SSH: Listing Directory
Doing Diffie-Hellman key exchange
Host key fingerprint is:
ssh-rsa 1024 (removed)
Initialised AES-256 client->server encryption
Initialised AES-256 server->client encryption
Sent password
Access granted
Opened channel for session
SSH: List complete 4 files.
Started a shell/command
SSH: CTS CONNECTED
SSH: Listing Directory
SSH: List complete 4 files.
SSH: Sending New2.Killme-64k.txt
SSH: Error while writing: no connection
Connection closed
Opening Connection sftp.elink-filetransfer.com:22
Server version: SSH-2.0-Maverick_SSHD
We claim version: SSH-2.0-PuTTY-FZ-Local: Jan 10 2012 12:44:00
Using SSH protocol version 2
Doing Diffie-Hellman group exchange
Doing Diffie-Hellman key exchange
Host key fingerprint is:
ssh-rsa 1024 (removed)
Initialised AES-256 client->server encryption
Initialised AES-256 server->client encryption
Sent password
Access granted
Opened channel for session
Started a shell/command
SSH: CTS CONNECTED
========================= end of SFTP log ==========

DOPUS 10.0.3.0.4392.x86
(with the SFTP option)

I routinely use Putty from a local server to transfer much larger files to the same SFTP site using the same login credentials.
The SFTP server will accept connections on port 22 and 31039. I have tried both with DOPUS and both fail.
The Putty scripts use port 31039.

-Mike-

2

Please check with Opus 10.0.4.0 (released earlier today), and if that still has problems try using WinSCP configured to copy using SSH (note: not SCP, which it also supports) to see if that has the same problem.

When testing with Putty, it may be copying the files via SCP which is different protocol to SSH.

3

10.0.4.0 did not fix the problem. Changed DOPUS default buffer size (Settings,Miscellaneous,Advanced) to 8k and it is now working and transferring files larger than 64k. My tech guy is speculating that the SFTP server doesn't allow large block sizes written to disk. Dunno, but it is now working.
-Mike-