Sponsored Content
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..
 

10 More Discussions You Might Find Interesting

1. UNIX for Advanced & Expert Users

determining open ports

hi all 1) how to determine available ports in a box (solaris) do i have to go for a netstat on all the ports? 2) how to block a particular port for a particular type of connection. Any help would be greatly appreciated Thanks (7 Replies)
Discussion started by: matrixmadhan
7 Replies

2. UNIX for Dummies Questions & Answers

Determining file length

How can I determine what UNIX thinks the record size of any given file is?? (1 Reply)
Discussion started by: jbrubaker
1 Replies

3. SCO

Blocking ports and reseting conections

Hi folks! We have SCO Open System V 5.0.5 here. When I type "netstat -n" I found a line mentioning a conection at the port 1025, as follows: tcp 0 0 quartzo.1025 200-203-8-90.csl.aas ESTABLISHED Here we use only conections thru ports 22,23 and 25. I would like to... (0 Replies)
Discussion started by: Marcio Moraes
0 Replies

4. Shell Programming and Scripting

Determining directory path

Hello, I have a script where I get the full directory path of the script being executed: BASE=$0 echo "BASE:" $BASE The output looks like this: BASE: /webapps/appsdev/ACURA/rlz/oses3.sh I'd like to truncate the shell name, leaving just the directory path. The directory path can be... (2 Replies)
Discussion started by: cwalsek
2 Replies

5. Shell Programming and Scripting

Problem determining file

I got the following code, it partially works. Can someone tell me why it partially doenst work? #!/bin/sh file=$1 if then echo "File is a directory" else echo "File is not a directory!" fi heres the output: philip@philip-laptop:~/Desktop$ sh exFive.sh test.java File is... (4 Replies)
Discussion started by: philmetz
4 Replies

6. Solaris

determining miniroot revision

Hi guys I have a bunch of x4100's x4140's etc with solaris 10 update4 running on them but I suspect that when a lot of these boxes were originally built, the jumpstart process used an update2 miniroot, now as far as i understand it, the miniroot used at jumpstart is the miniroot that stays on... (1 Reply)
Discussion started by: hcclnoodles
1 Replies

7. Solaris

Blocking outgoing connection to ports/host in solaris

Hi, I want to block all outgoing connection ( the IMAP ) to my exchnage . I have to do it in my solaris server; from solaris host no outgoing connection can be made to the imap server. Please help me to configure that. I am new in solaris. Kind regards, Akhtar (2 Replies)
Discussion started by: akhtarbd
2 Replies

8. Programming

determining the IP of a function

Is there a way to determine the "Instruction Pointer" of a function in c++, and if so can someone tell me? (5 Replies)
Discussion started by: neur0n
5 Replies

9. UNIX for Dummies Questions & Answers

Determining Disk Speed

Hi, I went to a computer store and the salesman sold me a SATA cable and told me that all SATA cables are the same. Another salesman at a different store told me a cable rated for SATA 2, which I bought, MIGHT work as well as one rate for SATA 3 but it is not guaranteed. I decided to run a... (3 Replies)
Discussion started by: mojoman
3 Replies

10. Programming

Which are blocking and non-blocking api's in sockets in C ?

among the below socket programming api's, please let me know which are blocking and non-blocking. socket accept bind listen write read close (2 Replies)
Discussion started by: VSSajjan
2 Replies
SERVICES(5)						     Linux Programmer's Manual						       SERVICES(5)

NAME
services - Internet network services list DESCRIPTION
services is a plain ASCII file providing a mapping between human-friendly textual names for internet services, and their underlying assigned port numbers and protocol types. Every networking program should look into this file to get the port number (and protocol) for its service. The C library routines getservent(3), getservbyname(3), getservbyport(3), setservent(3), and endservent(3) support querying this file from programs. Port numbers are assigned by the IANA (Internet Assigned Numbers Authority), and their current policy is to assign both TCP and UDP proto- cols when assigning a port number. Therefore, most entries will have two entries, even for TCP-only services. Port numbers below 1024 (so-called "low numbered" ports) can be bound to only by root (see bind(2), tcp(7), and udp(7)). This is so clients connecting to low numbered ports can trust that the service running on the port is the standard implementation, and not a rogue service run by a user of the machine. Well-known port numbers specified by the IANA are normally located in this root-only space. The presence of an entry for a service in the services file does not necessarily mean that the service is currently running on the machine. See inetd.conf(5) for the configuration of Internet services offered. Note that not all networking services are started by inetd(8), and so won't appear in inetd.conf(5). In particular, news (NNTP) and mail (SMTP) servers are often initialized from the system boot scripts. The location of the services file is defined by _PATH_SERVICES in <netdb.h>. This is usually set to /etc/services. Each line describes one service, and is of the form: service-name port/protocol [aliases ...] where: service-name is the friendly name the service is known by and looked up under. It is case sensitive. Often, the client program is named after the service-name. port is the port number (in decimal) to use for this service. protocol is the type of protocol to be used. This field should match an entry in the protocols(5) file. Typical values include tcp and udp. aliases is an optional space or tab separated list of other names for this service. Again, the names are case sensitive. Either spaces or tabs may be used to separate the fields. Comments are started by the hash sign (#) and continue until the end of the line. Blank lines are skipped. The service-name should begin in the first column of the file, since leading spaces are not stripped. service-names can be any printable characters excluding space and tab. However, a conservative choice of characters should be used to minimize compatibility problems. For example, a-z, 0-9, and hyphen (-) would seem a sensible choice. Lines not matching this format should not be present in the file. (Currently, they are silently skipped by getservent(3), getservby- name(3), and getservbyport(3). However, this behavior should not be relied on.) This file might be distributed over a network using a network-wide naming service like Yellow Pages/NIS or BIND/Hesiod. A sample services file might look like this: netstat 15/tcp qotd 17/tcp quote msp 18/tcp # message send protocol msp 18/udp # message send protocol chargen 19/tcp ttytst source chargen 19/udp ttytst source ftp 21/tcp # 22 - unassigned telnet 23/tcp FILES
/etc/services The Internet network services list <netdb.h> Definition of _PATH_SERVICES SEE ALSO
listen(2), endservent(3), getservbyname(3), getservbyport(3), getservent(3), setservent(3), inetd.conf(5), protocols(5), inetd(8) Assigned Numbers RFC, most recently RFC 1700, (AKA STD0002). COLOPHON
This page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/. Linux 2010-05-22 SERVICES(5)
All times are GMT -4. The time now is 07:15 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy