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FTP Issue Not Using Port 20 After Solaris 11.4 Patching to or Later (Doc ID 3010067.1)

Last updated on MARCH 21, 2024

Applies to:

Solaris Operating System - Version 11.4 and later
Information in this document applies to any platform.


FTP stops working after patching to or later -  at least should a firewall be  configured to pass traffic on the standard server data port 20 with the default (extended) passive mode.  

For example: 

FTP-Client>  ls -la
  FTP-Client>: PORT AA,BB,CC,DD,18,29     (note: the is the "universal address" with the last two octets noting the port # - port 4637 in this case)
    200 PORT command successful
  FTP-Client> NLST -la   
    425 Unable to build data connection: Operation already in progress
  FTP-Client> Std Return Code = 20425, Error Code = 00002

There is apparently a firewall blocking the port. 

Booting a BE earlier than will have the proftpd server selecting port 20 for it's data port in passive mode.


 Patching to Solaris later


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