[pptp-server] Linux firewall

[Alan Chung]

I have successfully setup a pptp server and tested it locally.  After I put 
it behind my current Redhat 6.2 firewall, it failed to connect to server.

I have the current ipchains rules setup for PPTP,

# port forwarding for 1723
ipmasqadm portfw -a -P tcp -L 211.2.228.100 1723 -R 192.168.0.6 1723

# redirect protocol 47
/usr/local/sbin/ipfwd --masq 192.168.0.6 47 &

# ipchains section
$IPCHAINS -A input   -p tcp -d 192.168.0.2/24 1723 -j ACCEPT
$IPCHAINS -A input   -p tcp -s 192.168.0.2/24 1723 -j ACCEPT
$IPCHAINS -A input   -p 47  -d 192.168.0.2/24        -j ACCEPT
$IPCHAINS -A input   -p 47  -s 192.168.0.2/24        -j ACCEPT

$IPCHAINS -A output  -p tcp -d 192.168.0.2/24 1723 -j ACCEPT
$IPCHAINS -A output  -p tcp -s 192.168.0.2/24 1723 -j ACCEPT
$IPCHAINS -A output  -p 47  -d 192.168.0.2/24        -j ACCEPT
$IPCHAINS -A output  -p 47  -s 192.168.0.2/24        -j ACCEPT

$IPCHAINS -A forward -p tcp -d 192.168.0.2/24 1723 -j ACCEPT
$IPCHAINS -A forward -p tcp -s 192.168.0.2/24 1723 -j ACCEPT
$IPCHAINS -A forward -p 47  -d 192.168.0.2/24        -j ACCEPT
$IPCHAINS -A forward -p 47  -s 192.168.0.2/24        -j ACCEPT

But I got the following error when I tried to access from my pptp-linux 
client to server through firewall,

warn[open_inetsock:pptp_callmgr.c:287]: connect: No route to host
fatal[callmgr_main:pptp_callmgr.c:122]: Could not open control connection 
to 211.2.228.100
fatal[launch_callmgr:pptp.c:213]: Call manager exited with error 256

Any clue?

Thanks in advance.

Alan