Since last 3 days, I am getting this error...before that it was working fine...there is not change at machine level nor at firewall.....any idea why its reported all of sudden...

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produced the following output:

Permission denied (gssapi-keyex,gssapi-with-mic,publickey,keyboard-interactive).
lost connection
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Thanks

i have also come across the same issue. If the password less authentication is configured with rsa key. Try regenerating the key, if still it does not work, create a dsa key and depolyed the new to remote machine. It will definetly work . I am still working on to find out the reason, will update you once i get something. Till that time, please follow what i mentioned, it will definetly work.

Thanks
Suman Kumar Mandal