In sum, you can either make Putty, secureCRT clients to use dh-group14-sha256 or set the SSH server on ASA to use dh-group14-sha1. Putty, SecureCRT clients can be customized to use 'diffie-hellman-group14-sha256' as well, but that is more of a client related configuration. Only different different is that group14 sha256 in diffie-hellman provides stronger negotiation. This will make PuTTY or SecureCRT to work. In previous versions, the SSH server on ASA defaults to 'dh-group14-sha1' and this is still configurable in your newer version of ASA. The firewall ASA at newer version images started to default their SSH server side configuration to use key-exhange group 'diffie-hellman-group14-sha256'. if its not registered, you can try re registering ( ) We will need show tech output to get more details.ġ. If the issue persists, check your SSL settings and make sure they match the requirements of the web browser you are using. Save the configuration and reload the ASA:Īfter the ASA is reloaded, try to access the ASDM again. Update the boot image reference in the configuration:Ĥ. The command for TFTP would be:Ĭopy tftp://(TFTP-Server-IP)/asa-image-name disk0:/asa-image-nameĬopy tftp://(TFTP-Server-IP)/asdm-image-name disk0:/asdm-image-nameģ. Upload the new ASA and ASDM images to the ASA using TFTP or SCP. Download the latest recommended ASA and ASDM software images from the Cisco website.Ģ. To upgrade the ASA software, follow these steps:ġ. You can do this by running the command "show run" and saving the output to a text file. You can try to update the ASA and ASDM software to the latest recommended version to resolve compatibility issues with modern web browsers.īefore you proceed, make sure to back up your current configuration. The issue might be related to the SSL protocol and cipher suite mismatch between the client and the server. It seems that you are using ASA Software Version 8.3(1) and Device Manager Version 6.4(5).
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