[c-nsp] ASA SSH problem

Tue Jul 31 12:54:34 EDT 2007

Hmm.  Do you have any static NATs assuming TCP port 22 on that interface's IP address.  I tried OpenSSH to my ASA running 7.2.2, worked fine.  Looked like this:

sullivan-asa-01# debug ssh
debug ssh  enabled at level 1
sullivan-asa-01# Device ssh opened successfully.
SSH1: SSH client: IP = 'X.Y.155.32'  interface # = 1
SSH: host key initialised
SSH1: starting SSH control process
SSH1: Exchanging versions - SSH-2.0-Cisco-1.25

SSH1: send SSH message: outdata is NULL

server version string:SSH-2.0-Cisco-1.25SSH1: receive SSH message: 83 (83)
SSH1: client version is - SSH-2.0-OpenSSH_3.8.1p1

client version string:SSH-2.0-OpenSSH_3.8.1p1SSH1: begin server key generation
SSH1: complete server key generation, elapsed time = 590 ms

SSH2 1: SSH2_MSG_KEXINIT sent
SSH2 1: SSH2_MSG_KEXINIT received
SSH2: kex: client->server aes128-cbc hmac-md5 none
SSH2: kex: server->client aes128-cbc hmac-md5 none
SSH2 1: expecting SSH2_MSG_KEXDH_INIT
SSH2 1: SSH2_MSG_KEXDH_INIT received
SSH2 1: signature length 271
SSH2: kex_derive_keys complete
SSH2 1: newkeys: mode 1
SSH2 1: SSH2_MSG_NEWKEYS sent
SSH2 1: waiting for SSH2_MSG_NEWKEYS
SSH2 1: newkeys: mode 0
SSH2 1: SSH2_MSG_NEWKEYS receivedSSH(pix): user authen method is 'no AAA', aaa s
erver group ID = 0
SSH(pix): user authen method is 'no AAA', aaa server group ID = 0

SSH2 1: authentication successful for pix
SSH2 1: channel open request
SSH2 1: pty-req request
SSH2 1: requested tty: cygwin, height 25, width 80

SSH2 1: shell request 

Chuck Church
Principal Network Engineer, CCIE #8776
Harris Information Technology Services
EDS Contractor - Navy Marine Corps Intranet (NMCI)
1210 N. Parker Rd. | Greenville, SC 29609 
Office: 864-335-9473 | Cell: 864-266-3978
cchurch at multimax.com

-----Original Message-----
From: Bagosi Rómeó [mailto:Romeo.Bagosi at integris.hu] 
Sent: Tuesday, July 31, 2007 10:32 AM
To: Church, Charles
Cc: cisco-nsp at puck.nether.net
Subject: RE: [c-nsp] ASA SSH problem

No, it doesn't worked:(
The problem is, that the first time asa permit ssh access to the device, than it discards, and the asa disconnects with 'Internal' or 'Time-out' error.

-----Original Message-----
From: Church, Charles [mailto:cchurch at multimax.com] 
Sent: Tuesday, July 31, 2007 4:17 PM
To: Bagosi Rómeó
Cc: cisco-nsp at puck.nether.net
Subject: RE: [c-nsp] ASA SSH problem

My bad, I was thinking of the IOS command, which is in seconds.  What if you try adding 'ssh version 2', so that it doesn't try version 1?  I think it'll default to AES256 then.  Might be worth a try. 

Chuck Church
Principal Network Engineer, CCIE #8776
Harris Information Technology Services
EDS Contractor - Navy Marine Corps Intranet (NMCI)
1210 N. Parker Rd. | Greenville, SC 29609 
Office: 864-335-9473 | Cell: 864-266-3978
cchurch at multimax.com

-----Original Message-----
From: Bagosi Rómeó [mailto:Romeo.Bagosi at integris.hu] 
Sent: Tuesday, July 31, 2007 9:48 AM
To: Church, Charles
Cc: cisco-nsp at puck.nether.net
Subject: RE: [c-nsp] ASA SSH problem

The 'ssh timeout 5' means 5 minutes timeout.
No, I didn't tried another SSH client. I used Debian's default Open SSH Client.
My ASA Version is 7.1(2). I've searched for bugs, with Cisco's bug toolkit and I've found a bug similar with my problem, but the workaround didn't helped.

-----Original Message-----
From: Church, Charles [mailto:cchurch at multimax.com] 
Sent: Tuesday, July 31, 2007 2:30 PM
To: Bagosi Rómeó
Cc: cisco-nsp at puck.nether.net
Subject: RE: [c-nsp] ASA SSH problem

5 seconds seems pretty short for a timeout.  Have you tried a different SSH client?  What encryption protocol is being used?  I use Putty all the time with an ASA, never seen this.  What ASA version is it, have you looked for bugs involving SSH?

Chuck

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Bagosi Rómeó
Sent: Tuesday, July 31, 2007 2:35 AM
To: Voll, Scott
Cc: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] ASA SSH problem

Hi!

1. I saved the rsa keys before reload. And after reload i've regenerated and deleted the keys, but doesn't helped.
2. I have the ssh x.x.x.x y.y.y.y outside command.

-----Original Message-----
From: Voll, Scott [mailto:Scott.Voll at wesd.org] 
Sent: Monday, July 30, 2007 4:44 PM
To: Bagosi Rómeó
Subject: RE: [c-nsp] ASA SSH problem

Two guesses.

1. your RSA key didn't get saved or
2. you don't have SSH allowed from that outside IP address ie. Ssh x.x.x.x y.y.y.y outside.

Just my first thoughts.

Scott

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Bagosi Rómeó
Sent: Monday, July 30, 2007 6:45 AM
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] ASA SSH problem

Hello Experts!

I have a problem connecting to ASA with SSH to the outside interface.
My SSH worked, but I've reloaded the ASA (with saved configuration), and now it doesn't works.
I want to connect from a Linux Server.

The SSH configuration is:
aaa authentication ssh console LOCAL
username admin password xxxxxx privilege 15
ssh *.*.6.1 255.255.255.255 outside
ssh timeout 5

I have public keys generated (using this device for VPN).

The debug ssh says:

%Device ssh opened successfully.
SSH0: SSH client: IP = '*.*.6.1'  interfaceS # = 1
SSH: host key initialAised
SSH0: starting SSH cont-rol process
SSH0: 6Exchanging versions - SSH-1.9-9-Cisco-1.25
SSH0: send SSH message:3 outdata is NU0LL 2

se0rver version s1tring:SSH-1.99-Cisco-1.253: Built inbound TCP connection 59 for outside:*.*.6.1/40706 (*.*.6.1/40706) to NP Identity Ifc:*.*.6.2/22 (*.*.6.2/22)

%ASA-7-710002: TCP access permitted from *.*.6.1/40706 to outside:*.*.6.2/ssh

SSH0: receive SSH message: 83 (83)
SSH0: client version is - SSH-2.0-OpenSSH_3.4p1

client version string:SSH-2.0-OpenSSH_3.4p1SSH0: begin server key generation
SSH0: complete server key generation, elapsed time = 770 ms

SSH2 0: SSH2_MSG_KEXINIT sent%ASA-7-710005: TCP request discarded from *.*.6.1/40706 to outside:*.*.6.2/22

%ASA-7-710005: TCP request discarded from *.*.6.1/40706 to outside:*.*.6.2/22

%ASA-6-302014: Teardown TCP connection 54 for outside:*.*.6.1/58911 to NP Identity Ifc:*.*.6.2/22 duration 0:10:25 bytes 1438 FIN Timeout

%ASA-6-302014: Teardown TCP connection 56 for outside:*.*.6.1/33068 to NP Identity Ifc:*.*.6.2/22 duration 0:08:07 bytes 2490 Connection timeout

%SSH0: Session disconneActed by SSH server - error 0x3c "Time-out activated"
SSH0: receive SSH message: [no message ID: variable *data is NULL]
SA-6-315011: SSH session from *.*.6.1 on interface outside for user "" disconnected by SSH server, reason: "Time-out activated" (0x3c) 

Now the SSH Server disconnected because of "Time-out activated", but several times disconnects with "Internal Error".

What can be the problem?

Thanks,
Romeo Bagosi

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