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Cisco Bug: CSCvu54000 - Firepower 4100 FTP Client in EPSV passive mode is not able to establish data channel with the Server

Last Modified

Sep 01, 2020

Products (1)

  • Cisco Firepower Management Center

Known Affected Releases


Description (partial)

When FTP Client works in EPSV passive mode, the data channel is treated as a new connection and FTP session might fail depending on AC policy.

Client uses EPSV passive mode:

Access Control Policy Rule contains: 
Port: FTP,  FTP-Data-20 Action Allow
Default rule : Block all traffic

Now from an FTP endpoint, try to login to the server and upload a file.

Expected output: File upload should go through. 

Actual Output: File upload is blocked.
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Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
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