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The private key file seemed to be working till a day before but from the last day, it generates an error while trying to connect to Amamzon ec2 ssh via the private key file. (am using Bitvise ssh client on windows 8).

the output error is as under:

19:02:01.634 Bitvise SSH Client, a fully featured SSH2 client.
Copyright (C) 2000-2013 by Bitvise Limited.
Portions Copyright (C) 1995-2003 by Wei Dai.
19:02:01.634 Visit www.bitvise.com for latest information about our SSH2 products.
19:02:01.634 Run 'BvSsh -help' to learn the supported command-line parameters.
19:02:01.853 Loading last used profile 'J:\Users\AbdulAli\Documents\ec2-user bitvise.bscp'.
19:02:01.854 Last used profile loaded successfully.
19:02:03.476 Starting a new SSH2 session.
19:02:03.477 Connecting to SSH2 server <ip>.
19:02:03.892 Connected.
19:02:03.928 Starting first key exchange.
19:02:04.301 Server version string: SSH-2.0-OpenSSH_6.2
19:02:05.083 New host key received. Algorithm: ssh-rsa, Size: 2048 bits, MD5 Fingerprint: e9:72:25:5a:d2:ce:0b:ef:35:1d:d1:90:9c:43:88:02, Bubble-Babble: xeles-zutyp-hohaz-puhyg-tadoz-mygyr-bicum-dozes-popyn-maleg-voxyx.
19:02:05.104 First key exchange completed.
19:02:05.127 Key exchange: diffie-hellman-group14-sha1. Session encryption: aes256-ctr, MAC: hmac-sha1, compression: none.
19:02:05.637 Attempting 'none' authentication.
19:02:06.137 Remaining authentication methods: 'publickey'.
19:02:07.776 Attempting 'publickey' authentication. Using keypair at slot 1.
19:02:08.207 Authentication failed. Remaining authentication methods: 'publickey'.
19:02:09.209 Session terminated on client's behalf:
no authentication methods available

as said that the same key was working since the start of this instance but has shown this error from a day or so.

any help will be appreciated.

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