how to open specific ports on my ASA 5505

Posted on 2014-11-19
Last Modified: 2014-11-21

Can someone tell me the process I need to open two ports on my firewall.
At present I'm running a cisco asa5505 firewall but I'm a little unsure how to open
both 18601 & 18603 ports on the firewall.
I can connect through ASDM v6.2 for the GUI interface as I'm not a fully conversant in CLI mode although I can use it if I have to.

I have included my running config which is very basic.
Hope this helps

ASA Version 8.2(1)
hostname ciscoasa
enable password 8Ry2YjIyt7RRXU24 encrypted
passwd 2KFQnbNIdI.2KYOU encrypted
interface Vlan1
 nameif inside
 security-level 100
 ip address
interface Vlan2
 nameif outside
 security-level 0
 ip address
interface Ethernet0/0
 switchport access vlan 2
interface Ethernet0/1
interface Ethernet0/2
interface Ethernet0/3
interface Ethernet0/4
interface Ethernet0/5
interface Ethernet0/6
interface Ethernet0/7
ftp mode passive
clock timezone GMT/BST 0
clock summer-time GMT/BDT recurring last Sun Mar 1:00 last Sun Oct 2:00
access-list Controller_in extended permit tcp any interface outside eq www
access-list Controller_In extended permit tcp any interface outside eq www
pager lines 24
logging buffered debugging
logging asdm informational
mtu inside 1500
mtu outside 1500
icmp unreachable rate-limit 1 burst-size 1
no asdm history enable
arp timeout 14400
global (outside) 1 interface
nat (inside) 1
static (inside,outside) tcp interface www www netmask
access-group Controller_In in interface outside
route outside 1
timeout xlate 3:00:00
timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 icmp 0:00:02
timeout sunrpc 0:10:00 h323 0:05:00 h225 1:00:00 mgcp 0:05:00 mgcp-pat 0:05:00
timeout sip 0:30:00 sip_media 0:02:00 sip-invite 0:03:00 sip-disconnect 0:02:00
timeout sip-provisional-media 0:02:00 uauth 0:05:00 absolute
timeout tcp-proxy-reassembly 0:01:00
dynamic-access-policy-record DfltAccessPolicy
http server enable
http inside
http inside
no snmp-server location
no snmp-server contact
snmp-server enable traps snmp authentication linkup linkdown coldstart
crypto ipsec security-association lifetime seconds 28800
crypto ipsec security-association lifetime kilobytes 4608000
telnet timeout 5
ssh timeout 5
console timeout 0
dhcpd auto_config outside
dhcpd address inside
dhcpd dns interface inside
dhcpd lease 28800 interface inside
dhcpd enable inside

threat-detection basic-threat
threat-detection statistics port
threat-detection statistics protocol
threat-detection statistics access-list
threat-detection statistics tcp-intercept rate-interval 30 burst-rate 400 average-rate 200
class-map inspection_default
 match default-inspection-traffic
policy-map type inspect dns preset_dns_map
  message-length maximum 512
policy-map global_policy
 class inspection_default
  inspect dns preset_dns_map
  inspect ftp
  inspect h323 h225
  inspect h323 ras
  inspect rsh
  inspect rtsp
  inspect esmtp
  inspect sqlnet
  inspect skinny  
  inspect sunrpc
  inspect xdmcp
  inspect sip  
  inspect netbios
  inspect tftp
service-policy global_policy global
prompt hostname context
: end
no asdm history enable

Question by:cannonz
  • 4
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LVL 24

Expert Comment

by:Ken Boone
ID: 40453381
What devices need to be access on these ports?

Author Comment

ID: 40453402

Basically I've downloaded an app from iTunes that gives me access to my flight management computer in MS FSX on my ipad rather than clicking it with my mouse on my PC which only works locally as far as I'm aware so I only need to open these ports internally (I think).
LVL 24

Expert Comment

by:Ken Boone
ID: 40453420
So let me make sure I understand where things are...  the flight mgmt computer is on the inside of the firewall, and the iPad is on the outside?  The iPad needs to reach the flight mgmt computer on those two ports from the outside of the firewall? Is that right?
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Author Comment

ID: 40453453
Yes the FMC is on the internal network if that's what you mean and the ipad is on my internal network (same one as my pc)
If I go to and ping either of these ports on my ipad it says ports are closed on my external ip.
Is this what you mean.?
LVL 24

Expert Comment

by:Ken Boone
ID: 40453581
So if all of the devices are on the inside of your network and they need to talk to each other on these ports, then the firewall has no play here.  It is not involved.    If all devices are on the inside, there will not need to be an opening in the firewall for something on the outside to reach these devices.  Does that make sense?

Author Comment

ID: 40453746
Is it possible that maybe it does need to connect to a central server online or something
Even though I would be using the app locally?
I will double check my PC tomorrow incase it's an issue with that end but I think that's  doubtful as my iPad can't even see these ports opened.
LVL 24

Accepted Solution

Ken Boone earned 500 total points
ID: 40454042
So if it needs to connect to something on the outside your firewall is already allowing all outbound traffic without any blocking.

Author Comment

ID: 40457041
After some more fault finding It appears that even though I have the downloaded software and paid for ipad app one program I use in the background on FSX needs to be registered as I only have a demo some programs won't work unless registered so I will have to register fsuip you would think it would at least flag this info up on the screen.
only found this out with a bit of research.

Thanks again for you help

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