Cisco Asa 5505 Generate Ssh Key
Find answers to Cisco ASA 5505 - SSH Network Error: Connection Refused from the expert community at Experts Exchange. Cisco ASA 5505 w/ Security Plus Cisco Adaptive Security Appliance Software Version 8.2(5). Did you generate RSA keys when you set up SSH? Aug 17, 2017 Connecting to Cisco ASA 5505. This person is a verified professional. Verify your account to enable IT peers to see that you are a professional. On Aug 16, 2017 at 12:27 UTC. Solved Cisco. Next: Cisco ASA VPN. For SSH to work you must generate rsa keys. Run show crypto key mypubkey rsa to see if you do, in fact, have a key fully generated and registered under a non-default name. If there is, then you can tell the ssh process to use this key with ip ssh rsa keypair-name xxx.If the first command doesn't show anything useful then I'd say you can go ahead and generate a new key. May 20, 2014 Author, teacher, and talk show host Robert McMillen shows you how to use the Cisco ASA version 9 generate RSA keys command. Quickly Enable SSH on a Cisco Router or Switch. Not sure what has happened, but this ASA has stopped accepting SSH connections. I did a conf t crypto key zeroize rsa crypto key generate rsa modulus 2048 crypto key generate rsa general-keys modulus 2048 wr mem sh ssh ssh 10.100.0.0 255.255.255.0 inside ssh 0.0.0.0 0.0.0.0 outside ssh timeout 60 ssh version 2.
KB ID 0001322
Problem
I’ve lost count of the number of times this has happened to me! Most of my colleagues prefer to use the ASDM for remote management, but if (like me) you work at command line, then sometimes people <ahem> forget to generate the RSA keypair when deploying a firewall. Then even if SSH access and AAA is setup correctly, you still can’t get in via SSH. Instead you see the following;
RoyalTS and RoyalTSX: ssh_exchange_identification: Connection closed by remote host.
PuTTY: PuTTY Fatal Error: Server unexpectedly closed network connection.
SecureCRT: Connection closed.
OSX/Linux: ssh_exchange_identification: Connection closed by remote host.
Now at command line you can fix this with a ‘Crypto Key Generate RSA Modulus 2048‘ command, but you can’t get to command line only ASDM.
Solution
On older versions of the ASDM you could generate the keypair in the Identification Certificates section (well you still can but only if you are also generating a certificate request file). So, as we are command line warriors, lets use the ASDM’s command line!
Tools > Command Line Interface > Multiple Line
Send > Wait a couple of minutes and try again.
REMEMBER: I’m assuming you have SSH setup correctly if not, see the following article;
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NA
Q: I have a Cisco switch in my network, which I can access by hooking up a console cable directly to the device. I like to access the switch remotely using SSH. How can I enable ssh on my Cisco 3750 Catalyst Switch?
A: By default, when you configure a Cisco device, you have to use the console cable and connect directly to the system to access it. Follow the steps mentioned below, which will enable SSH access to your Cisco devices. Once you enable SSH, you can access it remotely using PuTTY or any other SSH client.
1. Setup Management IP
First, make sure you have performed basic network configurations on your switch. For example, assign default gateway, assign management ip-address, etc. If this is already done, skip to the next step.
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In the following example, the management ip address is set as 192.168.101.2 in the 101 VLAN. The default gateway points to the firewall, which is 192.168.101.1
2. Set hostname and domain-name
Next, make sure the switch has a hostname and domain-name set properly.
3. Generate the RSA Keys
The switch or router should have RSA keys that it will use during the SSH process. So, generate these using crypto command as shown below.
Also, if you are running on an older Cisco IOS image, it is highly recommended that you upgrade to latest Cisco IOS.
4. Setup the Line VTY configurations
Setup the following line vty configuration parameters, where input transport is set to SSH. Set the login to local, and password to 7.
If you have not set the console line yet, set it to the following values.
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5. Create the username password
If you don’t have an username created already, do it as shown below.
Note: If you don’t have the enable password setup properly, do it now.
Make sure the password-encryption service is turned-on, which will encrypt the password, and when you do “sh run”, you’ll seee only the encrypted password and not clear-text password.
5. Verify SSH access
From the switch, if you do ‘sh ip ssh’, it will confirm that the SSH is enabled on this cisco device.
After the above configurations, login from a remote machine to verify that you can ssh to this cisco switch.
Generate Ssh Key Windows
In this example, 192.168.101.2 is the management ip-address of the switch.
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