How to troubleshoot an FTP\SFTP-related issue in FlexiCapture 12?

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Nikita Shevchenko

Question

How to troubleshoot an FTP\SFTP-related issue in FlexiCapture 12?

 

Answer

  • Consider using Wireshark to capture the traffic and analyze the response from the server.
  • Reproduce the issue in FlexiCapture 12 while capturing Wireshark logs.
  • Find the failed requests and analyze their response codes.
  • Eliminate the problem and perform another attempt to use FTP\SFTP with turned-on Wireshark.

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    Nikita Shevchenko

    Here is a follow-up that explains how exactly Wireshark logs can be analyzed. It is more convenient to use the FTP server logs, as they are more user-friendly:
    Try to locate the command with the FIN flag or write down the flags and data from each request:

     

    It is evident that the EPSV command leads to communication termination. The solution is to disable EPSV on the client side. However, it's important to note that this particular EPSV issue should not be applicable to FlexiCapture; this is just a synthetic example.

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    Nikita Shevchenko

    • Edited

    Here is an example of a successful delete command; it should be followed by a TCP Dup ACK. If this is missing, then the server does not permit the operation

     

    Also, you can use Analyze > Follow TCP from the top menu.

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