Checking for blocked ports from the firewall?

[Kelemvor]

Howdy,

I'm trying to run an app here at work and it's not working. Problem is I'm not sure if it's because the firewall is blocking the ports I need or if it's because I just set something up wrong.

Is there some website or program or something that I can use that will do some sort of scan and tell me if certain ports are blocked by our work firewall?

I'm not trying to circumvent it, I just want to stop wasting time checking for config issues if it's the stupid firewall getting in the way.

Thanks.

 

[n0cmonkey]

WRONG FORUM

 

[Heisenberg]

You might try one of the port-scan tests at dslreports.com.

 

[hevnsnt]

download nmap

 

[n0cmonkey]

Originally posted by: hevnsnt
download nmap

nmap will only help from the outside.

If he sends me his IP address, I'll gladly nmap him.

EDIT: You know this, I just wanted to make it clear for people that don't.

 

[FoBoT]

maybe this could help

http://www.protect-me.com/freeware.html - Active Ports

 

[Sundog]

Originally posted by: hevnsnt
download nmap

Have to look into that.

 

[Kelemvor]

Which forum would you suggest oh wise one.

Software - if there's an App to do it which is the question
Networking - but I'm not working on the entwork, just looking for info.
Tech Support - Sort of, but nothing is really broken
General Hardware - Since the firewall is a physical box.

 

[n0cmonkey]

Originally posted by: FrankyJunior
Which forum would you suggest oh wise one.

Software - if there's an App to do it which is the question
Networking - but I'm not working on the entwork, just looking for info.
Tech Support - Sort of, but nothing is really broken
General Hardware - Since the firewall is a physical box.

Networking or software. If you bothered to search, you'd know this has been answered in networking plenty of times. This _is_ a networking question moron.

 

[hevnsnt]

Originally posted by: n0cmonkey

Originally posted by: hevnsnt
download nmap

nmap will only help from the outside.

If he sends me his IP address, I'll gladly nmap him.

EDIT: You know this, I just wanted to make it clear for people that don't.

Yeah, but he could be trying to access another server inside the network (internal fw).. He would have to go into more details.. Maybe if he posts in the networking forum, he can go into more detail.

 

[eelw]

visit GRC and click on the Shields Up icon. Scroll down halfway to the Hot Spots and again click on the ShieldsUP! link. Click on the Proceed button. Enter the port number in the empty field and click on the User Specified Custom Port Probe.

 

[n0cmonkey]

Originally posted by: hevnsnt

Originally posted by: n0cmonkey

Originally posted by: hevnsnt
download nmap

nmap will only help from the outside.

If he sends me his IP address, I'll gladly nmap him.

EDIT: You know this, I just wanted to make it clear for people that don't.

Yeah, but he could be trying to access another server inside the network (internal fw).. He would have to go into more details.. Maybe if he posts in the networking forum, he can go into more detail.

Good point. I hate going across firewalls in day to day internal operations. It can be a pain in the butt.

 

[Stark]

there are two questions that need to be answered for your solution to be revealed

1. what port do you need open?
2. what ports are blocked on the firewall (if you're not an admin with rights to log in and check, this one whill be trickier)

 

[n0cmonkey]

Originally posted by: Stark
there are two questions that need to be answered for your solution to be revealed

1. what port do you need open?
2. what ports are blocked on the firewall (if you're not an admin with rights to log in and check, this one whill be trickier)

It's not tricky at all. You ASK THE SECURITY TEAM if the port you need is open.

 

[rudder]

telnet IP_address port_number

All of our user traffic passes through a firewall before it hits a server. So the telnet command is easy to use.

Or you can check out some foundstone tools.

 

[n0cmonkey]

I just realized I posted the EASIEST solution (also the least likely to get someone fired).