how to open specific port

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Operating Systems Solaris how to open specific port
# 1  
Old 02-25-2009
how to open specific port

Dear members,
My release is open Solaris b103
1- How to know the opening port in my system
2- How to open a specific port like port number 53
3- How to closed the specific port like port number 53

Your feedback highly appreciated
# 2  
Old 02-25-2009
netstat -an | grep LISTEN will show ports currently open.

As for how to open/close ports - depends on application you are running if/how you can assign specific port to the application config files.
# 3  
Old 02-25-2009
Dear PMM:-
My problem is be sure that the port number 53 is opening cause
When I try to access the internet I have the following :-
# ping is alive
# ping Yahoo!
Ping: unknown host
So when I put the Yahoo! at the browser it can’t be open
When I use this command
# dig Yahoo!
I got the real IP for yahoo home page when and put it in the browser the browser the yahoo home page is open but when i try to open any link it can't be open
After I check with my ISP cause no body from his customer service can be support UNIX system one of them say to me please check port 53 if open to retrieve DNS service or not cause my problem in DNS
Your feedback is highly appreciated
# 4  
Old 02-26-2009
It looks like you don't have a DNS server setup - you need to access this server on port 53, you don't need to run port 53 on your client.

Try running
- my output is below:

$ nslookup

Non-authoritative answer:
Name:   www.unix.comAddress:

Check /etc/resolv.conf where it sets up DNS
# 5  
Old 02-26-2009
Check whether your /etc/nsswitch.conf has a "hosts: files dns" entry. Without this your machine will not perform DNS lookups for hostnames. Look in /etc/nsswitch.dns file for sample "hosts" entry.
# 6  
Old 02-26-2009
all right and we used the cross over cable to ping the machine but did not work..
# 7  
Old 02-26-2009
try unplumbing and re-plumbing you network interface(s). also, if you change the nsswitch.conf file, restart nscd via svcadm.
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