Solved

cisco firewall asdm  - need to allow a port on an IP address

Posted on 2015-02-02
6
332 Views
Last Modified: 2015-02-04
Hi there.
I'm using the asdm (version 5) of a Cisco ASA 5520 firewall.
I am trying to allow access from any external IP address to access a server on port 8172.
I already have a NAT rule to translate from external IP address (1.2.3.4) to internal (192.168.1.10) this works fine for accessing port 80 etc from the outside world.
What steps do I need to take as I have tried adding access rules to allow to this port but i still cant telnet there.
Also, do I need to do anything with port forwarding or is this not relevant for the above?
0
Comment
Question by:jamiegf
  • 3
  • 3
6 Comments
 
LVL 28

Expert Comment

by:asavener
Comment Utility
Kinda depends on whether you're performing Port Address Translation (translating individual ports) or Network Address Translation (translating the IP address, which includes all ports).

If your NAT rules specify port numbers, then you need to add a NAT rule for the new port in addition to editing the ACL.

If your NAT rules only specify IP addresses, then editing the ACL should be enough to allow the traffic.


And make sure that the port is actually active on the server, and is not blocked by a local firewall.  If it's a Windows box, run "netstat -ano | find ":<port>" to see if the server is listening on the correct port.  Then check the Windows firewall.
0
 

Author Comment

by:jamiegf
Comment Utility
NAT rules only specify IP addresses.

I have tried adding security policies and also editing pre exisiting Service Groups to include my port number but i still cannot telnet to the port.
I have tested the other ports which work and do not work - these are behaving correctly.
I have also tried adding different protocols / ports but anything i add doesnt seem to come into effect .
0
 
LVL 28

Expert Comment

by:asavener
Comment Utility
Did you check that the port is open on the server?
0
Find Ransomware Secrets With All-Source Analysis

Ransomware has become a major concern for organizations; its prevalence has grown due to past successes achieved by threat actors. While each ransomware variant is different, we’ve seen some common tactics and trends used among the authors of the malware.

 

Author Comment

by:jamiegf
Comment Utility
Hi Asavener. Yes, i forgot to mention that. Windows firewall is turned off.
0
 
LVL 28

Accepted Solution

by:
asavener earned 500 total points
Comment Utility
Can you successfully telnet to the port when you're inside the network?



Suggest the next step is to use the packet tracer feature in ASDM to simulate the traffic.  The ASA will test the traffic against all of its rules and tell you whether it will pass the traffic or deny it.
0
 

Author Closing Comment

by:jamiegf
Comment Utility
"Can you successfully telnet to the port when you're inside the network?"
No - i couldnt, which told me the app is not working as it should.

I set up a website and gave it port 8172 to test my firewall rules; it works fine.

Thanks for your help Asavener :)
0

Featured Post

IT, Stop Being Called Into Every Meeting

Highfive is so simple that setting up every meeting room takes just minutes and every employee will be able to start or join a call from any room with ease. Never be called into a meeting just to get it started again. This is how video conferencing should work!

Join & Write a Comment

To setup a SonicWALL for policy based routing to be used with the Websense Content Gateway there are several steps that need to be completed. Below is a rough guide for accomplishing this. One thing of note is this guide is intended to assist in the…
This article offers some helpful and general tips for safe browsing and online shopping. It offers simple and manageable procedures that help to ensure the safety of one's personal information and the security of any devices.
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…

772 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

12 Experts available now in Live!

Get 1:1 Help Now