On Tue, 19 Jul 2011, hadi motamedi wrote: > Dear All > With respect to the references you gave me, I figured out to add the > following line to my /etc/sysconfig/iptables : > -A RH-Firewall-1-INPUT -p udp -m udp --dport 53 -j ACCEPT > Then I issued: > #service iptables restart > And now the windows machine can browse valid url . Thank you for your help. > I want to put more stuff on my centos 5.6 machine. To this end, I > installed ultraedit, octave, gschem,shorewall on my centos 5.6 > machine. But I don't see one-to-one relationship between these > applications and the ones I have on my windows machine. For example, > the octave does not have the same power as MATLAB on windows machine > or Pspice on windows is more powerful than the the one I have on my > centos. Can you please let me know where powerful centos stuffs for > various purposes can be selected and installed from the internet? So you've installed Octave but it's not as powerful as MATLAB on windows. I know this is crazy talk, but have you tried MATLAB on CentOS? There is no one-to-one relationship between applications on one OS and on another. Keep googling. jh