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Problems tirying to setup a pptp server begin a firewall

 Hi all, I'm triying to do the next setup ...

 Inet <-> Sid FW (Pc1,eth1-inet,eth0-lan) <-> Sid PPTPd (Pc2,eth0-lan)

 On the PC1 I have done this                                                    

 iptables -t nat -A PREROUTING -p gre -j DNAT --to                  
 iptables -t nat -A PREROUTING -p tcp --dport 1723 -j DNAT --to     

 Along other rules that don't get into colission with this ones                 

 When I try to make a conx from a WinXX machine with the VPN support            
(pptp), It connect (I saw the pptpd launching the pppd on the PC2),             
and there is GRE traffic (tcpdump -i eth0 proto gre; on pc2 show                
that), but the WinXX machine allway stay saing "Checking username and           
password" till it get a timeout.                                                

 Appart from a possible problem with the pptpd/pppd config, are this            
rules OK to *forward* such kind of traffic from the FW to the internal          
server ?                                                                        

 Thx in advance

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