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Symptom: Unable to establish a SSH session with a Cisco ASA firewall. After logging in using ASDM you see this error in the log:
fail to establish SSH session because RSA host key retrieval failed
To fix, go to the command line interface:
ASDM → Tools → Command Line Interface
And enter these commands:
conf t crypto key generate rsa general-keys modulus 1024
Now you can establish a connection over SSH.
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