topic SSH does not work in inside interface in ASA in Network Security

SSH does not work in inside interface in ASA

Chieu Dinh — Fri, 21 Feb 2020 12:56:32 GMT

I am able to run ASM but I can't run SSH from inside interface. Does anyone know how can I start to debug the problem? I checked all the setting for enable ssh, I setup it the same way as an instruction.

aaa authentication ssh console LOCAL

ssh 192.168.0.0 255.255.255.0 inside

crypto key generate rsa modulus 1024

What I am missing here? I also have username and password for admin.

Thanks

SSH does not work in inside interface in ASA

mahesh18 — Mon, 29 Jul 2013 23:44:36 GMT

Hi Chieu,

Can you provide the output of sh ver?

Thanks

mahesh

SSH does not work in inside interface in ASA

mahesh18 — Mon, 29 Jul 2013 23:45:55 GMT

Also check when you do sh ver

Encryption-DES : Enabled perpetual

Encryption-3DES-AES : Enabled perpetual

Do you see above two things enabled?

Thanks

Mahesh

SSH does not work in inside interface in ASA

Chieu Dinh — Mon, 29 Jul 2013 23:48:26 GMT

Here is the show ver

Result of the command: "show ver"

Cisco Adaptive Security Appliance Software Version 8.2(3)3
Device Manager Version 6.2(5)53

Compiled on Wed 25-Aug-10 21:43 by builders
System image file is "disk0:/asa823-3-k8.bin"
Config file at boot was "startup-config"

ciscoasa up 207 days 6 hours

Hardware: ASA5510, 1024 MB RAM, CPU Pentium 4 Celeron 1599 MHz
Internal ATA Compact Flash, 256MB
BIOS Flash Firmware Hub @ 0xffe00000, 1024KB

Encryption hardware device : Cisco ASA-55x0 on-board accelerator (revision 0x0)
                             Boot microcode   : CN1000-MC-BOOT-2.00
                             SSL/IKE microcode: CNLite-MC-SSLm-PLUS-2.03
                             IPSec microcode : CNlite-MC-IPSECm-MAIN-2.04

0: Ext: Ethernet0/0         : address is 5475.d050.7f46, irq 9
1: Ext: Ethernet0/1         : address is 5475.d050.7f47, irq 9
2: Ext: Ethernet0/2         : address is 5475.d050.7f48, irq 9
3: Ext: Ethernet0/3         : address is 5475.d050.7f49, irq 9
4: Ext: Management0/0       : address is 5475.d050.7f45, irq 11
5: Int: Not used            : irq 11
6: Int: Not used            : irq 5

Licensed features for this platform:
Maximum Physical Interfaces    : Unlimited
Maximum VLANs                  : 50
Inside Hosts                   : Unlimited
Failover                       : Disabled
VPN-DES                        : Enabled
VPN-3DES-AES                   : Enabled
Security Contexts              : 0
GTP/GPRS                       : Disabled
SSL VPN Peers                  : 2
Total VPN Peers                : 250
Shared License                 : Disabled
AnyConnect for Mobile          : Disabled
AnyConnect for Cisco VPN Phone : Disabled
AnyConnect Essentials          : Disabled
Advanced Endpoint Assessment   : Disabled
UC Phone Proxy Sessions        : 2
Total UC Proxy Sessions        : 2
Botnet Traffic Filter          : Disabled

This platform has a Base license.

Serial Number: JMX1420L3JW
Running Activation Key: 0x8b0edb7c 0x4cee2474 0x34813190 0x90e01484 0x0d2211b2
Configuration register is 0x1
Configuration last modified by cdinh at 15:36:53.519 PDT Mon Jul 29 2013

SSH does not work in inside interface in ASA

Chieu Dinh — Mon, 29 Jul 2013 23:50:42 GMT

It was working before I added the new VPN tunnel with another ASA. I did not know what configuration that I had removed to lost this setting.

SSH does not work in inside interface in ASA

mahesh18 — Mon, 29 Jul 2013 23:54:14 GMT

Hi Chieu,

Can you provide the output of sh run ssh?

Thanks

MAhesh

SSH does not work in inside interface in ASA

mahesh18 — Tue, 30 Jul 2013 00:13:01 GMT

Hi Chieu,

If it was working before then try to regenerate the keys?

Hope it will not effect any vpn config

ASA1(config)# crypto key zeroize rsa

WARNING: All RSA keys will be removed.

WARNING: All device digital certificates issued using these keys will also be removed.

Do you really want to remove these keys? [yes/no]: yes

thanks

mahesh

SSH does not work in inside interface in ASA

Chieu Dinh — Tue, 30 Jul 2013 00:17:45 GMT

here is the show run ssh

ssh 192.168.25.0 255.255.255.0 inside

ssh 192.168.16.0 255.255.255.0 inside

ssh 192.168.15.0 255.255.255.0 inside

ssh 0.0.0.0 0.0.0.0 inside

ssh timeout 5

Thanks

SSH does not work in inside interface in ASA

Chieu Dinh — Tue, 30 Jul 2013 00:18:46 GMT

It might effect my vpn config

SSH does not work in inside interface in ASA

mahesh18 — Tue, 30 Jul 2013 00:20:22 GMT

Hi Chieu,

Can you remove lines below

ssh 192.168.25.0 255.255.255.0 inside

ssh 192.168.16.0 255.255.255.0 inside

ssh 192.168.15.0 255.255.255.0 inside

and try again.

Thanks

mahesh

SSH does not work in inside interface in ASA

Chieu Dinh — Tue, 30 Jul 2013 00:23:30 GMT

It does not work after I removed these lines:

ssh 192.168.25.0 255.255.255.0 inside

ssh 192.168.16.0 255.255.255.0 inside

ssh 192.168.15.0 255.255.255.0 inside

SSH does not work in inside interface in ASA

mahesh18 — Tue, 30 Jul 2013 00:24:41 GMT

But you have this line right

ssh 0.0.0.0 0.0.0.0 inside ?

Thanks

MAhesh

SSH does not work in inside interface in ASA

Chieu Dinh — Tue, 30 Jul 2013 00:26:01 GMT

Yes. I still have ssh 0.0.0.0 0.0.0.0 inside

SSH does not work in inside interface in ASA

Chieu Dinh — Tue, 30 Jul 2013 18:00:32 GMT

Hi Mahesh

Do you have any ideas to troubleshooting this problem? Do I need any access list for inside interface?

SSH does not work in inside interface in ASA

mahesh18 — Tue, 30 Jul 2013 18:11:45 GMT

Hi Chieu,

Seems when you are behind the inside interface of ASA then you are on same network so you do not need ACL then.

You can try to regenerate the crypto keys as i mentioned earlier.

I could not think anything else for the moment.

Thanks

MAhesh

SSH does not work in inside interface in ASA

Marvin Rhoads — Wed, 31 Jul 2013 04:43:17 GMT

Can you ping the workstation that is trying to ssh into the ASA inside interface from the ASA itself?

Does the ASA routing setup require that traffic to leave via the inside interface?

When you try unsuccessfully to ssh into the ASA does the syslog show any related events?