Getting "Internal Server Error" from SFTP server

My SFTP installation is used to fetch files from a specific SFTP server. It
has been working fine for many months and now suddenly it is failing. I
suspect that my company has upgraded their SFTP server.

Some shorter files (about 78k bytes) work fine, but when it attempts to
download a 36Mbyte file it fails with -31 (LIBSSH2_ERROR_SFTP_PROTOCOL).
Oddly enough, it fails in the first call to libssh2_sftp_read() (with a
buffer of 40,000 bytes), so I'm not sure what the length of the file has to
do with anything.

I can use filezilla to successfully download the files using SFTP, so I'm
not sure if this is a problem with their server or libssh2.

I've done a run with debug tracing on and I've attached the output.
Unfortunately, I'm not sure what I'm looking at, except for the bit at the
end where it receives this from the server:

0000: 5E 00 00 00 00 00 00 00 2D 00 00 00 29 65 00 00 : ^.......-...)e..
0010: 00 02 00 00 00 04 00 00 00 16 49 6E 74 65 72 6E : ..........Intern
0020: 61 6C 20 73 65 72 76 65 72 20 65 72 72 6F 72 2E : al server error.
0030: 00 00 00 02 65 6E : ....en

I've tried it with wincng and openssl and both fail and I've tried a buffer
size of 2000 bytes instead of 40000.

I've found in the past that I NEED to specify a buffer that is an exact
multiple of 2000 bytes for it to work with this SFTP server.

If anyone has any ideas on how to proceed, I'd greatly appreciate it.

Thanks,
Bob Kast

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