ASA Connection Error: ‘The First Key-Exchange Algorithm’
KB ID 0001476 Problem When attempting to connect to a Cisco ASA firewall via SSH you see the following error; The first key-exchange algorithm supported by the server is diffie-hellman-group1-sha1, which is below the configured warning threshold. Do you want to continue with this connection? Clicking ‘Yes’ will let you connect. Solution When connected, execute the following commands; conf t ssh key-exchange group...
Cisco Router – Configure Site to Site IPSEC VPN
KB ID 0000933 Problem I’ve done thousands of firewall VPN’s but not many that terminate on Cisco Routers. It’s been a few years since I did one, and then I think I was a wuss and used the SDM. So when I was asked to do one last week thankfully I had the configs ready to go. I’m going to use the IP addresses above, and my tunnel will use the following settings; Encryption: AES. Hashing: SHA. Diffie Hellman:...
Cisco ASA Site to Site VPN’sSite to Site ISAKMP VPN (Main Mode)
KB ID 0000213 Problem As with most things, before you have a hope of fixing something, you will stand a better chance if you know how it works in the first place. Below is a quick run though of what’s happening with your site to site VPN’s and how they work. For the entire process we will have two Cisco ASA 5500 firewalls and a site to site VPN. Solution What’s an Initiator and a Responder? 1. Our Laptop 192.168.1.50...