squid problem

[dogar]

hello dear all
I m using Redhat Linux 9 with squid squid-2.5.STABLE1-2.i386.rpm.
on linux machine wan ip is 10.0.0.25 and Lan ip is 172.50.50.50. it is a sub proxy as our main proxy is using one live ip and Local ip is 10.0.0.20 which is being used as proxy. browsing is ok on sub proxy but I can not access internet from client. the client detail is given below.
ip 172.50.125.125
subnet 255.255.0.0
gw 172.50.0.1

Proxy is 172.50.50.50

when I try to access the following massege is shown.

"Connection Failed
the system returned
(110) connection timed out
the remote host or network may be down."
Please guide me what should be the dns on sub proxy or any other problem.

waiting for early reply from any expert
Thanks

[falko]

I guess it's a firewall/NAT problem on your subproxy. What's the output of

iptables -L

?