topic Re: 5512 ASA open Port 443 in Network Security

5512 ASA open Port 443

cchen — Mon, 19 Dec 2022 21:49:06 GMT

hello,
I have a firewall 5512 asa I need help to port forward to port 443
I already set up the forward, according this guide https://www.petenetlive.com/KB/Article/0000077,
but the port seems be blocked.
before the port forward I had to change the webvpn port 443 to another, after that I created network object and access rule

I use ASDM 7.1 and have ASA Version 9.1

Re: 5512 ASA open Port 443

MHM Cisco World — Mon, 19 Dec 2022 22:03:58 GMT

""but the port seems be blocked.""
how you know that ?

to check config use this command
ciscoasa# sh asp table socket

Re: 5512 ASA open Port 443

cchen — Tue, 20 Dec 2022 07:26:51 GMT

Since I forwarded the Port it should open a webpage that I host on that forwarded IP
I checked it with a port scanner service

Output of sh asp table socket
Protocol Socket State Local Address Foreign Address
SSL 000065f8 LISTEN 192.168.4.1:4433 0.0.0.0:*
SSL 008928a8 ESTAB 192.168.4.1:4433 192.168.4.2:65418
SSL 008a87b8 ESTAB 192.168.4.1:4433 192.168.4.2:65424
SSL 008f4198 ESTAB 192.168.4.1:4433 192.168.4.2:50365

Re: 5512 ASA open Port 443

MHM Cisco World — Tue, 20 Dec 2022 08:50:46 GMT

I see three user hence I think the issue is license where ASA come with 3 user.
so you need license to allow more users.

Re: 5512 ASA open Port 443

cchen — Tue, 20 Dec 2022 09:08:44 GMT

which license feature do I need to increase ?

I need the Port 443 to get state listen, dont I ?

Re: 5512 ASA open Port 443

MHM Cisco World — Tue, 20 Dec 2022 09:20:12 GMT

""before the port forward I had to change the webvpn port 443 to another, after that I created network object and access rule""
so I understand that you have SSL anyconnect and you change webvpn to other port in outside interface? please confirm that.

Re: 5512 ASA open Port 443

cchen — Tue, 20 Dec 2022 09:26:54 GMT

No it was not outside interface, the 443 was the webvpn for ASDM access

Re: 5512 ASA open Port 443

Marvin Rhoads — Tue, 20 Dec 2022 13:46:44 GMT

If you have remote access VPN ("webvpn") or ASDM access enabled on port 443,those must be changed before setting up any NAT rule or port forwarding to use the interface address port 443.

Please share your current config for those options if you have any doubt.

Re: 5512 ASA open Port 443

MHM Cisco World — Tue, 20 Dec 2022 13:52:15 GMT

not OUT side interface ?
you meaning using different interface than OUT for SSL connection ??
can you share the config ?

Re: 5512 ASA open Port 443

cchen — Wed, 21 Dec 2022 08:12:29 GMT

""If you have remote access VPN ("webvpn") or ASDM access enabled on port 443,those must be changed before setting up any NAT rule or port forwarding to use the interface address port 443.""
This is what I exactly did

Here is my config

: Saved
:
ASA Version 9.1(2) 
!
hostname asaname21
domain-name namecl
enable password *** encrypted
names
ip local pool 10er-Einwahl-name2 10.0.0.1-10.0.0.100 mask 255.255.255.0
!
interface GigabitEthernet0/0
nameif modem
security-level 100
pppoe client vpdn group Vodafone
ip address pppoe setroute 
!
interface GigabitEthernet0/0.7
vlan 7
nameif modem_t
security-level 100
pppoe client vpdn group Vodafone
ip address pppoe setroute 
!
interface GigabitEthernet0/1
nameif inside
security-level 100
ip address 192.168.2.254 255.255.255.0 
!
interface GigabitEthernet0/2
shutdown
no nameif
no security-level
no ip address
!
interface GigabitEthernet0/3
shutdown
no nameif
no security-level
no ip address
!
interface GigabitEthernet0/4
shutdown
no nameif
no security-level
no ip address
!
interface GigabitEthernet0/5
shutdown
no nameif
no security-level
no ip address
!
interface Management0/0
management-only
nameif management
security-level 100
ip address 192.168.4.1 255.255.255.0 
!
ftp mode passive
clock timezone CEST 1
clock summer-time CEDT recurring last Sun Mar 2:00 last Sun Oct 3:00
dns server-group DefaultDNS
domain-name namecl
same-security-traffic permit inter-interface
object network NETWORK_OBJ_192.168.1.0_24
subnet 192.168.1.0 255.255.255.0
object network NETWORK_OBJ_192.168.2.0_24
subnet 192.168.2.0 255.255.255.0
object network NETWORK_OBJ_10.0.0.0_25
subnet 10.0.0.0 255.255.255.128
object network Telefonanlagename2
host 192.168.2.11
description Telefonanlage
object network TRMM
host 192.168.2.142
description Tactical RMM
access-list modem_cryptomap extended permit ip 192.168.2.0 255.255.255.0 192.168.1.0 255.255.255.0 
access-list modem_t_cryptomap_65535 extended permit ip any4 any4 
access-list modem_t_cryptomap_1 extended permit ip 192.168.2.0 255.255.255.0 192.168.1.0 255.255.255.0 
access-list modem_t_access_in extended permit tcp any object TRMM eq https 
access-list modemt_access_in extended permit tcp any object TRMM eq https 
access-list modem_access_in extended permit tcp any object TRMM eq https 
access-list OUT-IN extended permit tcp any object TRMM eq https 
pager lines 24
logging enable
logging asdm informational
mtu modem 1492
mtu modem_t 1492
mtu inside 1500
mtu management 1500
no failover
icmp unreachable rate-limit 1 burst-size 1
no asdm history enable
arp timeout 14400
no arp permit-nonconnected
nat (inside,modem_t) source static NETWORK_OBJ_192.168.2.0_24 NETWORK_OBJ_192.168.2.0_24 destination static NETWORK_OBJ_192.168.1.0_24 NETWORK_OBJ_192.168.1.0_24 no-proxy-arp route-lookup
nat (inside,modem_t) source static any any destination static NETWORK_OBJ_10.0.0.0_25 NETWORK_OBJ_10.0.0.0_25 no-proxy-arp route-lookup
!
object network TRMM
nat (inside,modem_t) static interface service tcp https https 
!
nat (inside,modem_t) after-auto source dynamic any interface
access-group modem_access_in in interface modem
access-group OUT-IN in interface modem_t
timeout xlate 3:00:00
timeout pat-xlate 0:00:30
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
timeout floating-conn 0:00:00
dynamic-access-policy-record DfltAccessPolicy
user-identity default-domain LOCAL
http server enable 4433
http 192.168.4.0 255.255.255.0 management
no snmp-server location
no snmp-server contact
snmp-server enable traps snmp authentication linkup linkdown coldstart warmstart
crypto ipsec ikev1 transform-set ESP-AES-128-SHA esp-aes esp-sha-hmac 
crypto ipsec ikev1 transform-set ESP-AES-128-MD5 esp-aes esp-md5-hmac 
crypto ipsec ikev1 transform-set ESP-AES-192-SHA esp-aes-192 esp-sha-hmac 
crypto ipsec ikev1 transform-set ESP-AES-192-MD5 esp-aes-192 esp-md5-hmac 
crypto ipsec ikev1 transform-set ESP-AES-256-SHA esp-aes-256 esp-sha-hmac 
crypto ipsec ikev1 transform-set ESP-AES-256-MD5 esp-aes-256 esp-md5-hmac 
crypto ipsec ikev1 transform-set ESP-AES-128-SHA-TRANS esp-aes esp-sha-hmac 
crypto ipsec ikev1 transform-set ESP-AES-128-SHA-TRANS mode transport
crypto ipsec ikev1 transform-set ESP-AES-128-MD5-TRANS esp-aes esp-md5-hmac 
crypto ipsec ikev1 transform-set ESP-AES-128-MD5-TRANS mode transport
crypto ipsec ikev1 transform-set ESP-AES-192-SHA-TRANS esp-aes-192 esp-sha-hmac 
crypto ipsec ikev1 transform-set ESP-AES-192-SHA-TRANS mode transport
crypto ipsec ikev1 transform-set ESP-AES-192-MD5-TRANS esp-aes-192 esp-md5-hmac 
crypto ipsec ikev1 transform-set ESP-AES-192-MD5-TRANS mode transport
crypto ipsec ikev1 transform-set ESP-AES-256-SHA-TRANS esp-aes-256 esp-sha-hmac 
crypto ipsec ikev1 transform-set ESP-AES-256-SHA-TRANS mode transport
crypto ipsec ikev1 transform-set ESP-AES-256-MD5-TRANS esp-aes-256 esp-md5-hmac 
crypto ipsec ikev1 transform-set ESP-AES-256-MD5-TRANS mode transport
crypto ipsec ikev1 transform-set ESP-3DES-SHA esp-3des esp-sha-hmac 
crypto ipsec ikev1 transform-set ESP-3DES-MD5 esp-3des esp-md5-hmac 
crypto ipsec ikev1 transform-set ESP-3DES-SHA-TRANS esp-3des esp-sha-hmac 
crypto ipsec ikev1 transform-set ESP-3DES-SHA-TRANS mode transport
crypto ipsec ikev1 transform-set ESP-3DES-MD5-TRANS esp-3des esp-md5-hmac 
crypto ipsec ikev1 transform-set ESP-3DES-MD5-TRANS mode transport
crypto ipsec ikev1 transform-set ESP-DES-SHA esp-des esp-sha-hmac 
crypto ipsec ikev1 transform-set ESP-DES-MD5 esp-des esp-md5-hmac 
crypto ipsec ikev1 transform-set ESP-DES-SHA-TRANS esp-des esp-sha-hmac 
crypto ipsec ikev1 transform-set ESP-DES-SHA-TRANS mode transport
crypto ipsec ikev1 transform-set ESP-DES-MD5-TRANS esp-des esp-md5-hmac 
crypto ipsec ikev1 transform-set ESP-DES-MD5-TRANS mode transport
crypto ipsec ikev2 ipsec-proposal AES256
protocol esp encryption aes-256
protocol esp integrity sha-1 md5
crypto ipsec ikev2 ipsec-proposal AES192
protocol esp encryption aes-192
protocol esp integrity sha-1 md5
crypto ipsec ikev2 ipsec-proposal AES
protocol esp encryption aes
protocol esp integrity sha-1 md5
crypto ipsec ikev2 ipsec-proposal 3DES
protocol esp encryption 3des
protocol esp integrity sha-1 md5
crypto ipsec ikev2 ipsec-proposal DES
protocol esp encryption des
protocol esp integrity sha-1 md5
crypto ipsec security-association pmtu-aging infinite
crypto dynamic-map SYSTEM_DEFAULT_CRYPTO_MAP 65535 set ikev2 ipsec-proposal AES256 AES192 AES 3DES DES
crypto map modem_map 1 match address modem_cryptomap
crypto map modem_map 1 set pfs 
crypto map modem_map 1 set peer 185.133.106.4 
crypto map modem_map 1 set ikev1 transform-set ESP-AES-128-SHA ESP-AES-128-MD5 ESP-AES-192-SHA ESP-AES-192-MD5 ESP-AES-256-SHA ESP-AES-256-MD5 ESP-3DES-SHA ESP-3DES-MD5 ESP-DES-SHA ESP-DES-MD5
crypto map modem_map 1 set reverse-route
crypto map modem_map 65535 ipsec-isakmp dynamic SYSTEM_DEFAULT_CRYPTO_MAP
crypto map modem_map interface modem_t
crypto map modem_t_map 1 match address modem_t_cryptomap_1
crypto map modem_t_map 1 set pfs 
crypto map modem_t_map 1 set peer 80.79.226.22 
crypto map modem_t_map 1 set ikev1 transform-set ESP-AES-128-SHA ESP-AES-128-MD5 ESP-AES-192-SHA ESP-AES-192-MD5 ESP-AES-256-SHA ESP-AES-256-MD5 ESP-3DES-SHA ESP-3DES-MD5 ESP-DES-SHA ESP-DES-MD5
crypto map modem_t_map 1 set reverse-route
crypto map modem_t_map 65535 match address modem_t_cryptomap_65535
crypto map modem_t_map 65535 set ikev2 ipsec-proposal AES256 AES192 AES 3DES DES
crypto ca trustpoint _SmartCallHome_ServerCA
crl configure
crypto ca trustpoint ASDM_TrustPoint0
enrollment self
subject-name CN=asaname21
keypair nameCoburgLand
proxy-ldc-issuer
crl configure
crypto ca trustpool policy
crypto ca certificate chain _SmartCallHome_ServerCA
certificate ca 6ecc7aa5a7032009b8cebcf4e952d491
308205ec 308204d4 a0030201 0202106e cc7aa5a7 032009b8 cebcf4e9 52d49130 
0d06092a 864886f7 0d010105 05003081 ca310b30 09060355 04061302 55533117 
30150603 55040a13 0e566572 69536967 6e2c2049 6e632e31 1f301d06 0355040b 
13165665 72695369 676e2054 72757374 204e6574 776f726b 313a3038 06035504 
0b133128 63292032 30303620 56657269 5369676e 2c20496e 632e202d 20466f72 
20617574 686f7269 7a656420 75736520 6f6e6c79 31453043 06035504 03133c56 
65726953 69676e20 436c6173 73203320 5075626c 69632050 72696d61 72792043 
65727469 66696361 74696f6e 20417574 686f7269 7479202d 20473530 1e170d31 
30303230 38303030 3030305a 170d3230 30323037 32333539 35395a30 81b5310b 
30090603 55040613 02555331 17301506 0355040a 130e5665 72695369 676e2c20 
496e632e 311f301d 06035504 0b131656 65726953 69676e20 54727573 74204e65 
74776f72 6b313b30 39060355 040b1332 5465726d 73206f66 20757365 20617420 
68747470 733a2f2f 7777772e 76657269 7369676e 2e636f6d 2f727061 20286329 
3130312f 302d0603 55040313 26566572 69536967 6e20436c 61737320 33205365 
63757265 20536572 76657220 4341202d 20473330 82012230 0d06092a 864886f7 
0d010101 05000382 010f0030 82010a02 82010100 b187841f c20c45f5 bcab2597 
a7ada23e 9cbaf6c1 39b88bca c2ac56c6 e5bb658e 444f4dce 6fed094a d4af4e10 
9c688b2e 957b899b 13cae234 34c1f35b f3497b62 83488174 d188786c 0253f9bc 
7f432657 5833833b 330a17b0 d04e9124 ad867d64 12dc744a 34a11d0a ea961d0b 
15fca34b 3bce6388 d0f82d0c 948610ca b69a3dca eb379c00 48358629 5078e845 
63cd1941 4ff595ec 7b98d4c4 71b350be 28b38fa0 b9539cf5 ca2c23a9 fd1406e8 
18b49ae8 3c6e81fd e4cd3536 b351d369 ec12ba56 6e6f9b57 c58b14e7 0ec79ced 
4a546ac9 4dc5bf11 b1ae1c67 81cb4455 33997f24 9b3f5345 7f861af3 3cfa6d7f 
81f5b84a d3f58537 1cb5a6d0 09e4187b 384efa0f 02030100 01a38201 df308201 
db303406 082b0601 05050701 01042830 26302406 082b0601 05050730 01861868 
7474703a 2f2f6f63 73702e76 65726973 69676e2e 636f6d30 12060355 1d130101 
ff040830 060101ff 02010030 70060355 1d200469 30673065 060b6086 480186f8 
45010717 03305630 2806082b 06010505 07020116 1c687474 70733a2f 2f777777 
2e766572 69736967 6e2e636f 6d2f6370 73302a06 082b0601 05050702 02301e1a 
1c687474 70733a2f 2f777777 2e766572 69736967 6e2e636f 6d2f7270 61303406 
03551d1f 042d302b 3029a027 a0258623 68747470 3a2f2f63 726c2e76 65726973 
69676e2e 636f6d2f 70636133 2d67352e 63726c30 0e060355 1d0f0101 ff040403 
02010630 6d06082b 06010505 07010c04 61305fa1 5da05b30 59305730 55160969 
6d616765 2f676966 3021301f 30070605 2b0e0302 1a04148f e5d31a86 ac8d8e6b 
c3cf806a d448182c 7b192e30 25162368 7474703a 2f2f6c6f 676f2e76 65726973 
69676e2e 636f6d2f 76736c6f 676f2e67 69663028 0603551d 11042130 1fa41d30 
1b311930 17060355 04031310 56657269 5369676e 4d504b49 2d322d36 301d0603 
551d0e04 1604140d 445c1653 44c1827e 1d20ab25 f40163d8 be79a530 1f060355 
1d230418 30168014 7fd365a7 c2ddecbb f03009f3 4339fa02 af333133 300d0609 
2a864886 f70d0101 05050003 82010100 0c8324ef ddc30cd9 589cfe36 b6eb8a80 
4bd1a3f7 9df3cc53 ef829ea3 a1e697c1 589d756c e01d1b4c fad1c12d 05c0ea6e 
b2227055 d9203340 3307c265 83fa8f43 379bea0e 9a6c70ee f69c803b d937f47a 
6decd018 7d494aca 99c71928 a2bed877 24f78526 866d8705 404167d1 273aeddc 
481d22cd 0b0b8bbc f4b17bfd b499a8e9 762ae11a 2d876e74 d388dd1e 22c6df16 
b62b8214 0a945cf2 50ecafce ff62370d ad65d306 4153ed02 14c8b558 28a1ace0 
5becb37f 954afb03 c8ad26db e6667812 4ad99f42 fbe198e6 42839b8f 8f6724e8 
6119b5dd cdb50b26 058ec36e c4c875b8 46cfe218 065ea9ae a8819a47 16de0c28 
6c2527b9 deb78458 c61f381e a4c4cb66
quit
crypto ca certificate chain ASDM_TrustPoint0
certificate c6a6ae54
30820240 308201a9 a0030201 020204c6 a6ae5430 0d06092a 864886f7 0d010105 
05003032 3111300f 06035504 03130861 7361736f 66653131 1d301b06 092a8648 
86f70d01 0902160e 61736173 6f666531 2e617362 636c301e 170d3135 30313132 
31343538 35375a17 0d323530 31303931 34353835 375a3032 3111300f 06035504 
03130861 7361736f 66653131 1d301b06 092a8648 86f70d01 0902160e 61736173 
6f666531 2e617362 636c3081 9f300d06 092a8648 86f70d01 01010500 03818d00 
30818902 818100aa 657eb97c 7541f36a 87bcb30e cb2d19c5 fd5aaa9a 2b0e726f 
262598b6 497fd5c5 8733ce3b c3970985 73e22f2b 58336e5e 62594c8f 92cc9dd8 
e1421e0b 9d2b741f eec13695 ea016bc1 d5a5dfce 182e8c74 e3f6cda6 e7cc6778 
5a4bb3e9 1d0f4f34 3200e237 59297dbe 21df43a3 a91e29cc 1f319521 c9d6db02 
b5f07522 386bc702 03010001 a3633061 300f0603 551d1301 01ff0405 30030101 
ff300e06 03551d0f 0101ff04 04030201 86301f06 03551d23 04183016 801456c7 
77744994 775b3c8d 864d74b7 6fc390ac 6bc0301d 0603551d 0e041604 1456c777 
74499477 5b3c8d86 4d74b76f c390ac6b c0300d06 092a8648 86f70d01 01050500 
03818100 423a852d 38883c9d 7381d8f4 fce3bc7c 53c6bab0 e89e9572 e496808b 
9fc771eb ae049ba5 d34f0ab3 849eda54 4f5c0f80 7236c71d cde18f1b ea3bbdb7 
2b22c365 e8d2efe7 f553e9b7 bfe66075 ced970a2 66da309b 73cb6733 105a4210 
081eb4fa d65f909e b925e1f5 5ecd2b4c be98297b 949df421 2f6487b8 a6bc88b5 
b8f7714a
quit
crypto ikev2 policy 1
encryption aes-256
integrity sha
group 5 2
prf sha
lifetime seconds 86400
crypto ikev2 policy 10
encryption aes-192
integrity sha
group 5 2
prf sha
lifetime seconds 86400
crypto ikev2 policy 20
encryption aes
integrity sha
group 5 2
prf sha
lifetime seconds 86400
crypto ikev2 policy 30
encryption 3des
integrity sha
group 5 2
prf sha
lifetime seconds 86400
crypto ikev2 policy 40
encryption des
integrity sha
group 5 2
prf sha
lifetime seconds 86400
crypto ikev2 enable modem
crypto ikev2 enable modem_t
crypto ikev2 remote-access trustpoint ASDM_TrustPoint0
crypto ikev1 enable modem
crypto ikev1 enable modem_t
crypto ikev1 policy 10
authentication crack
encryption aes-256
hash sha
group 2
lifetime 86400
crypto ikev1 policy 20
authentication rsa-sig
encryption aes-256
hash sha
group 2
lifetime 86400
crypto ikev1 policy 30
authentication pre-share
encryption aes-256
hash sha
group 2
lifetime 86400
crypto ikev1 policy 40
authentication crack
encryption aes-192
hash sha
group 2
lifetime 86400
crypto ikev1 policy 50
authentication rsa-sig
encryption aes-192
hash sha
group 2
lifetime 86400
crypto ikev1 policy 60
authentication pre-share
encryption aes-192
hash sha
group 2
lifetime 86400
crypto ikev1 policy 70
authentication crack
encryption aes
hash sha
group 2
lifetime 86400
crypto ikev1 policy 80
authentication rsa-sig
encryption aes
hash sha
group 2
lifetime 86400
crypto ikev1 policy 90
authentication pre-share
encryption aes
hash sha
group 2
lifetime 86400
crypto ikev1 policy 100
authentication crack
encryption 3des
hash sha
group 2
lifetime 86400
crypto ikev1 policy 110
authentication rsa-sig
encryption 3des
hash sha
group 2
lifetime 86400
crypto ikev1 policy 120
authentication pre-share
encryption 3des
hash md5
group 2
lifetime 86400
crypto ikev1 policy 130
authentication crack
encryption des
hash sha
group 2
lifetime 86400
crypto ikev1 policy 140
authentication rsa-sig
encryption des
hash sha
group 2
lifetime 86400
crypto ikev1 policy 150
authentication pre-share
encryption des
hash sha
group 2
lifetime 86400
telnet timeout 5
ssh timeout 5
ssh key-exchange group dh-group1-sha1
console timeout 0
vpdn group Vodafone request dialout pppoe
vpdn group Vodafone localname 0028708763945511347130510001@t-online.de
vpdn group Vodafone ppp authentication pap
vpdn username 0028708763945511347130510001@t-online.de password ***** 
dhcpd address 192.168.4.2-192.168.4.254 management
dhcpd dns 192.168.2.1 192.168.1.1 interface management
dhcpd enable management
!
threat-detection basic-threat
threat-detection statistics access-list
no threat-detection statistics tcp-intercept
ssl trust-point ASDM_TrustPoint0 modem
webvpn
anyconnect-essentials
group-policy GroupPolicy_VPN_location2 internal
group-policy GroupPolicy_VPN_location2 attributes
wins-server none
dns-server value 208.67.222.222 192.168.2.1
vpn-tunnel-protocol ikev2 ssl-client 
default-domain value namecl
webvpn
anyconnect profiles value VPN_location2_client_profile type user
group-policy GroupPolicy1 internal
group-policy GroupPolicy1 attributes
vpn-tunnel-protocol ikev1 
tunnel-group 185.133.106.4 type ipsec-l2l
tunnel-group 185.133.106.4 general-attributes
default-group-policy GroupPolicy1
tunnel-group 185.133.106.4 ipsec-attributes
ikev1 pre-shared-key *****
tunnel-group VPN_location2 type remote-access
tunnel-group VPN_location2 general-attributes
address-pool 10er-Einwahl-name2
default-group-policy GroupPolicy_VPN_location2
tunnel-group VPN_location2 webvpn-attributes
group-alias VPN_location2 enable
!
class-map inspection_default
match default-inspection-traffic
!
!
policy-map type inspect dns preset_dns_map
parameters
message-length maximum client auto
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 
inspect ip-options 
!
service-policy global_policy global
prompt hostname context 
call-home reporting anonymous
Cryptochecksum:fe7b832b6607cd8da2f0b4fbde7465f4
: end
no asdm history enable

Re: 5512 ASA open Port 443

cchen — Wed, 21 Dec 2022 13:25:13 GMT

I have some news.

The https connections works now, my last change was about the security level in the interfaces.
I set them both at 100.

But I cant connect via https if I'm in "inside" interface.
I only saw the connection worked because I checked at home.
But I need the access too if I'm in inside interface.

Do I need create more rules ?
I access the via an URL https://domain.com
the domain.com points to the public IP

The browser loads this page

Re: 5512 ASA open Port 443

Marvin Rhoads — Wed, 21 Dec 2022 13:51:35 GMT

You cannot normally connect to a public IP presented on the outside interface of a firewall if you are on the inside. You can play some tricks with DNS to get the FQDN to resolve to your internal address - that's the most common means used for such access.

Re: 5512 ASA open Port 443

cchen — Wed, 21 Dec 2022 14:09:01 GMT

how do I resolve it in the firewall or do I resolve it on the DNS Server?

Re: 5512 ASA open Port 443

cchen — Wed, 21 Dec 2022 14:13:49 GMT

the outside interface which has the public ip forward it to the inside server tho ?

Re: 5512 ASA open Port 443

MHM Cisco World — Fri, 23 Dec 2022 09:35:45 GMT

I will check your config today

Re: 5512 ASA open Port 443

cchen — Fri, 23 Dec 2022 09:44:03 GMT

Hey according to @Marvin Rhoads I cant access the server if Im in the same network.

It seems like it could be solved by hairpin nat, do you know how do configure it ?
Thx for your time

Re: 5512 ASA open Port 443

Rob Ingram — Fri, 23 Dec 2022 09:53:05 GMT

@cchen example of NAT reflection/hairpin:-

nat (inside,inside) source static INTERNAL-LAN interface destination static SERVER01-NAT-IP SERVER01-REAL-IP

Change the objects to reflect your internal network.

Guide here for FTD but it's the same logic for ASA.

Re: 5512 ASA open Port 443

MHM Cisco World — Fri, 23 Dec 2022 11:56:30 GMT

you enable http in which port ?
I see your config you mention that you enable hhtp in management interface

Re: 5512 ASA open Port 443

Marvin Rhoads — Fri, 23 Dec 2022 12:22:39 GMT

As @Rob Ingram noted, we can do it with hairpin NAT.

I didn't actually say you cannot do it, only that "You cannot normally connect to a public IP presented on the outside interface of a firewall if you are on the inside. You can play some tricks with DNS to get the FQDN to resolve to your internal address - that's the most common means used for such access."

Note that hairpin NAT will "trick" the traffic to come back inwards without having been actually processed by the full firewall logic. For that reason (among others) we generally try to avoid it. There are many thing an ASA CAN do; but that doesn't mean we SHOULD do them all.

Re: 5512 ASA open Port 443

MHM Cisco World — Fri, 23 Dec 2022 12:22:20 GMT

totally right.