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Question:

Sporadic SFTP Upload Failure

Jan 11 '17 at 16:08

A user is reporting sporadic failures with the log shown below. Any ideas on what could be causing this?

      InitializeSftp:
        DllDate: Jun 13 2016
        ChilkatVersion: 9.5.0.58
        UnlockPrefix: MLLTSFSSH
        Architecture: Little Endian; 32-bit
        Language: ActiveX
        VerboseLogging: 0
        sshTransportOpenChannel:
          channelType: session
          clientChannel: 0
          clientInitialWindowSize: 327680
          clientMaxPacketSize: 32768
          Sent open channel request
          sockRecv failed.
          sockRecvN_buf: Did not receive the exact number of bytes desired.
          numBytesToReceive: 16
          numBytesReceived: 0
          Failed to read 1st block_size bytes..
          Error reading channel response.
        --sshTransportOpenChannel
        SSH read timed out.
        Failed.
      --InitializeSftp
    --ChilkatLog

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Answer

Sometimes the server has very old ssh libs, can cause some of these type of failures. Also look at SoSndBuf, and SoRecBuff, we set ours to 262144.

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Answer

OOPS, the initializeSftp fails.

I guess you would have to use something like Filezilla or WinSCP to get that info.

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Answer

Thanks. How does one check for old ssh libs? On the client? On the server?

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Answer

on the server, This is Perl. right after initializeSftp

my $intVal = $self->getSSHVersion($ftp->lastErrorText());

getSSHVersion subroutine parses for text SshVersion returned by lastErrorText.

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Answer

Thanks for the follow up.