Upgrade problem with wu-ftp 2.6.1 using EPSV command

[Stephen Hayter_1]

Hello Folks,

I have just upgraded to wu-ftp v2.6.1 from the legacy ftpd on HP-UX 11i. However I've encountered a
problem which causes an ftp session to hang! Before the upgrade, an application which uses ftp
was able to send data okay to the system in question and used the PASV command in doing so.
After the upgrade this application now tries to use the EPSV command instead and wu-ftp justs hangs at this point. The follwing is the output from the sending machine (running the legacy ftp on 11i) to the newly upgraded machine:

< 220 mimas FTP server (Revision 1.002 Version wuftpd-2.6.1 Wed Jan 2 06:26:08 GMT 2002) ready.
> USER anonymous
< 331 Guest login ok, send your complete e-mail address as password.
> PASS anonymous
< 230 Guest login ok, access restrictions apply.
* We have successfully logged in
> PWD
< 257 "/" is current directory.
* Entry path is '/'
* Connected to mimas (x.x.x.x)
> CWD ./prod1
< 250 CWD command successful.
> EPSV

Here the FTP hangs as there are no further responses from either system.

I know EPSV is an ipv6 feature, but nothing (I believe) is configured on either machine to use ipv6

Thank