Net::SSH::HostKeyMismatch Maybe cache

Hi,

I have a function that call Net::SSH
and I got a Net::SSH::HostKeyMismatch problem.
However I’ve clean known_hosts already and restart rails.

I guess this is a caching problem.
How can I clean cache so it won’t take old keys.

Thanks

/usr/lib/ruby/gems/1.8/gems/net-ssh-2.0.3/lib/net/ssh/verifiers/strict.rb:49:in

process_cache_miss' /usr/lib/ruby/gems/1.8/gems/net-ssh-2.0.3/lib/net/ssh/verifiers/strict.rb:38:inverify’
/usr/lib/ruby/gems/1.8/gems/net-ssh-2.0.3/lib/net/ssh/verifiers/lenient.rb:15:in
verify' /usr/lib/ruby/gems/1.8/gems/net-ssh-2.0.3/lib/net/ssh/transport/kex/diffie_hellman_group1_sha1.rb:165:inverify_server_key’
/usr/lib/ruby/gems/1.8/gems/net-ssh-2.0.3/lib/net/ssh/transport/kex/diffie_hellman_group1_sha1.rb:68:in
exchange_keys' /usr/lib/ruby/gems/1.8/gems/net-ssh-2.0.3/lib/net/ssh/transport/algorithms.rb:331:inexchange_keys’
/usr/lib/ruby/gems/1.8/gems/net-ssh-2.0.3/lib/net/ssh/transport/algorithms.rb:172:in
proceed!' /usr/lib/ruby/gems/1.8/gems/net-ssh-2.0.3/lib/net/ssh/transport/algorithms.rb:163:insend_kexinit’
/usr/lib/ruby/gems/1.8/gems/net-ssh-2.0.3/lib/net/ssh/transport/algorithms.rb:118:in
`accept_kexinit’