Explanation
The FTP client sent an EPRT
command to the z/OS® FTP
server to establish a data connection. The network protocol specified
on the EPRT command is not allowed for the current session because
it is not the same protocol the client used to log in to FTP.
netprt_specified is
the network protocol address family number specified on the EPRT
command.
netprt_allowed is the network
protocol address family number allowed for the current session.
Address
family (AF) numbers correspond to protocols supported by the FTP
server. The address family numbers are defined in RFC 1700. See
Related protocol specifications for information about
accessing RFCs. The FTP server might return one of these values:
- AF number
- Protocol
- 1
- Internet Protocol Version 4
- 2
- Internet Protocol Version 6
The z/OS FTP server
supports both IPv4 and IPv6, but the EPRT command is not allowed
to specify a protocol different from that used for the current session.
An FTP client may send such a command when the user is attempting
proxy transfer between two servers known to the client by IP addresses
of different protocol families.
System action
The FTP server rejects the
EPRT command. Processing continues.
User response
If you received this reply
while attempting a proxy transfer of data between two servers, and
the file transfer failed subsequent to this reply, try one of the
strategies listed below. If you received this reply under any other
circumstance, report the error to the system programmer.
- Log in to the FTP servers as before, but reverse the order in
which you log in to those servers. Try the proxy transfer again.
The strategy is to reverse the roles of the FTP servers from the
client's perspective so that the FTP client sends PORT or EPRT to
the other FTP server.
- Log in to each server again by specifying server IP addresses
of the same protocol family, and try the proxy transfer again.
If you know the servers only by DNS names, ask the system programmer
what the server IP addresses are. If both servers are z/OS FTP servers,
this is the only way to successfully proxy transfer files.
- If neither of the above strategies succeeds, you cannot proxy
transfer files directly between the servers. Transfer the file first
to the client, then from the client to the other server.
System programmer response
If the user
is attempting proxy transfer, verify that the user correctly attempted
the strategies described under User or Operator Response. Otherwise,
report the error to the provider of the FTP client software.