problems with port forwarding

["Andres Baravalle" <andres.baravalle@gmail.com>]

Hi,
I need to forward a port from one server to another - and I'm having
some trouble.

I have a server (A) and I want connections to port 10022 in server A
to be forwarded to port 22 in server B.

I tough I got the procedure correctly, because it's working using
another server (C) and server B.

Anyway, here are the relevant tables:

iptables -L --line-numbers -t nat

Chain PREROUTING (policy ACCEPT)
num  target     prot opt source               destination
1    DNAT       tcp  --  anywhere             anywhere            tcp
dpt:ftp to:SERVER_B:22
2    LOG        all  --  anywhere             SERVER_B    LOG level debug

Chain POSTROUTING (policy ACCEPT)
num  target     prot opt source               destination
1    SNAT       tcp  --  anywhere             SERVER_B    tcp dpt:ssh
to:SERVER_A
2    LOG        tcp  --  anywhere             SERVER_B    LOG level debug

iptables -L FORWARD

Chain FORWARD (policy DROP)
target     prot opt source               destination
ACCEPT     all  --  anywhere             anywhere            state
RELATED,ESTABLISHED
REJECT     tcp  --  anywhere             anywhere            tcp
flags:!SYN,RST,ACK/SYN reject-with tcp-reset
DROP       all  --  anywhere             anywhere            state INVALID
ACCEPT     tcp  --  anywhere             SERVER_B    tcp dpt:10022
ACCEPT     all  --  anywhere             anywhere
LOG        tcp  --  anywhere             SERVER_B    LOG level warning

If I connect from server A to localhost, port 10022, it works. If I
connect from any other machine to server A, port 10022, it doesn't.

Any suggestions? I've been looking at this and making tests for a long
time today and I can't find the error.

By the way, I can't see any entries in the log...

  Andres