Bug ID 422897: FTP may fail if port needs translation

Last Modified: Oct 16, 2023

Affected Product(s):
BIG-IP LTM(all modules)

Known Affected Versions:
11.2.0, 11.2.1, 11.3.0, 11.4.0, 11.4.1

Fixed In:
11.5.0, 11.4.1 HF6, 11.3.0 HF8, 11.2.1 HF11

Opened: Jun 07, 2013

Severity: 3-Major

Related Article: K14527

Symptoms

FTP may not work when a port requires translation but the IP address does not. In this scenario, the data channel for the FTP transfer may fail.

Impact

FTP fails.

Conditions

In an FTP transfer, the port requires translation but the address does not. For active FTP auto-lasthop or a lasthop pool is configured. For passive FTP, gateway pool is configured. An example of this scenario in active FTP, is if the SNAT is not set and port is configured to be any port.

Workaround

For active FTP, you can use SNAT to work around the issue. For passive FTP, port translate configuration need to be same as address translate configuration to avoid the issue.

Fix Information

FTP will work in case of port translation is needed.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips