PK50971: WHEN USING NON DEFAULT PORTS FOR AN FTP SERVER, WEBSPHERE EDGE LOAD BALANCER DOES NOT DETECT THE DATA PORT

APAR status

• Closed as program error.

Error description

• For FTP, the data port is opened from the backend server to the
  client. WebSPhere Edge Load Balancer sees a [SYN, ACK] as the
  first packet on the connection. Load Balancer has a check that
  the [SYN, ACK] is only valid if using the wildcard port (0) or
  the default FTP data port of 20.
  

Local fix

• N/A
  

Problem summary

• When FTP involves a control port (client -> server) and a data
  port (server->client), LB will only work with the standard ports
  20 & 21.
  

Problem conclusion

• Modified code to allow default ftp ports to be changed. To
  change the default ports, user must enter "dscontrol e xm 47
  <ControlPort> <DataPort>". This statement must come after the
  cluster is added but before the ports are added. Only the
  controlport should be added to LB.
  Affects all OSes.
  Fix levels :
     5.1.1.77
     6.0.2.73
     6.1.0.16
  Does not apply to ipv6 releases.
  
  NOTE-There can only be 1 FTP control/data pair. To balance
  traffic for multiple FTP sites, they will need to use the same
  ports but configured on different clusters.
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  WAS LOAD BALANC

• Fixed component ID

  5630A3611

Applicable component levels

• R510 PSY

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