Cisco Bug: CSCta20975 - ftp inspection does not understand 50x replies from ftp server
Feb 01, 2017
- Cisco ACE 4700 Series Application Control Engine Appliances
Known Affected Releases
Symptom: FTP data channel failed to be established. The ftp client gets a RST from the ACE. This happens beacause the ftp client sends a EPRT |1|188.8.131.52|44751| to which the ftp replyes with an error, i.e. 501 EPRT: Operation not permitted The ftp client understands the 501 error and tries again with the PORT 141,38,30,212,174,207 command. At this point, the ACE closes the connection with a RST packet. NOTE: This is seen both in ACE module A2(1.5) and appliance A3(2.2). Conditions: The ftp client tries the EPRT command, ftp server does not accept (i.e. 501 or 500 error) and the ftp client tries the PORT command for the same purpose.
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