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Special Forums IP Networking Help determining what's blocking ports Post 302275643 by lasitha2005d on Sunday 11th of January 2009 06:58:25 PM
Old 01-11-2009
Hi

Definitely your Active Directory computer configurations should be checked. If the group policy prevents or any other systems such as ISA server is placed or any software firewall have been placed , you won't be able to connect to the internet. Start from the gateway and the DNS servers...And especially the internet server or the internet perimeter. May b a router...May be the gateway...Start from the internet gateway. And for campuses there has to be policy for internet usage...Try to scan a web site using nmap and check whether their is a block . It will do tracert too.Scan services also. Use latest version. Start from the smallest thing. The servers always have unique and dedicated IP s. So it will b easy when you have found the ip address assignment.
Smilie I think otheus sounds right.

Last edited by lasitha2005d; 01-11-2009 at 08:06 PM..
 

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ipkungfu(8)						      System Manager's Manual						       ipkungfu(8)

NAME
ipkungfu - An iptables-based firewall for Linux SYNOPSIS
ipkungfu [ -c ] [ -t ] [ -d ] [ -h ] [ -v ] [ --quiet ] [ --panic ] [ --no-caching DESCRIPTION
ipkungfu is an iptables-based Linux firewall. The primary design goals are security, ease of use, and performance, in that order. It takes advantage of advanced features of iptables, tcpwrappers, and the Linux kernel. It also simplifies the configuration of internet connection sharing, advanced routing, and other networking needs. OPTIONS
-c (or --check) Check whether ipkungfu is loaded, and report any command line options it may have been loaded with. -t (or --test) Runs a configuration test, and displays the results. Note that this does not test or display all configuration options. This gives you an opportunity to verify that major configuration options are correct before putting them into action. -d (or --disable) Disables the firewall. It is important to know exactly what this option does. All traffic is allowed in and out, and in the case of a gateway, all NATed traffic is forwarded (the option retains your connection sharing options). Custom rules are not implemented, and deny_hosts.conf is ignored. -f (or --flush) Disables the firewall COMPLETELY. All rules are flushed, all chains are removed. Any port forwarding or internet connection sharing will cease to work. -h (or --help) Displays brief usage information and exits. -v (or --version) Displays version information and exits. --quiet Runs ipkungfu with no standard output --panic Drops ALL traffic in all directions on all network interfaces. You should probably never use this option. The --panic option is available for the highly unusual situation where you know that an attack is underway but you know of no other way to stop it. --failsafe If ipkungfu fails, --failsafe will cause all firewall policies to revert to ACCEPT. This is useful when working with ipkungfu remotely, to prevent loss of remote access due to firewall failure. --no-caching Disables rules caching feature. FILES
/etc/ipkungfu/ipkungfu.conf /etc/ipkungfu/advanced.conf /etc/ipkungfu/accept_hosts.conf /etc/ipkungfu/deny_hosts.conf /etc/ipkungfu/custom.conf /etc/ipkungfu/log.conf /etc/ipkungfu/redirect.conf /etc/ipkungfu/services.conf /usr/sbin/ipkungfu /usr/share/doc/ipkungfu/AUTHORS /usr/share/doc/ipkungfu/README /usr/share/doc/ipkungfu/FAQ /usr/share/doc/ipkungfu/ChangeLog /usr/share/doc/ipkungfu/COPYING SEE ALSO
iptables(8). January 2003 ipkungfu(8)
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